2026-09-12T18:09:37.931745Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="compile_runtime"}: package build phase finished phase="compile_runtime" elapsed_ms=0 success=true
2026-09-12T18:09:38.028829Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: loaded mid-plan search state path=artifacts/search-state-20260912/bs1/state.json attempts=24
2026-09-12T18:09:38.820021Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/baseline-480354-0000.json scope="baseline" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:09:48.726261Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: screened exchange table geometry expansion_ms=8245 expansion_and_footprint_ms=9905 estimated_row_bytes=37528 heuristic_row_bytes=107364 geometry_fragments_per_tile=4313 fragment_limit=16384
2026-09-12T18:09:48.883024Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:09:49.452019Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:09:49.452055Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.455110Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:09:49.481333Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:09:49.481371Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.483342Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:09:49.483360Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.484929Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:09:49.486867Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:09:49.495375Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=49 candidates=17 ordinary_horizon=688 paired_horizon=1417 use_paired=false
2026-09-12T18:09:49.506006Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:09:49.506054Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.512510Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:09:49.514908Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:09:49.514957Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.515381Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:09:49.515415Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.517324Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:09:49.518803Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:09:49.519237Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:09:49.519262Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.520363Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:09:49.520395Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.520434Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:09:49.522170Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:09:49.524335Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:09:49.524370Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.527640Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:09:49.540558Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:09:49.540639Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.542117Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:09:49.542529Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:09:49.542573Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.546590Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:09:49.548311Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:09:49.548335Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.549751Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:09:49.566931Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=55 candidates=4 ordinary_horizon=69 paired_horizon=128 use_paired=false
2026-09-12T18:09:49.590465Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:09:49.590503Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.590705Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:09:49.590732Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.591938Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:09:49.592618Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:09:49.598951Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:09:49.598975Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.600043Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:09:49.603588Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=56 candidates=10 ordinary_horizon=355 paired_horizon=603 use_paired=false
2026-09-12T18:09:49.621121Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:09:49.621145Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.622145Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:09:49.653465Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:09:49.653501Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.656365Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:09:49.656374Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:09:49.656399Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.658807Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:09:49.665786Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:09:49.665812Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.676405Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:09:49.679003Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:09:49.679033Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.690725Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:09:49.740407Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:09:49.740448Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.743520Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:09:49.757029Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:09:49.757055Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.762146Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:09:49.764164Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:09:49.764220Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.777528Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:09:49.811285Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:09:49.811317Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.824106Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:09:49.824142Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.832176Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:09:49.833614Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:09:49.856863Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:09:49.856916Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:49.893434Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:09:50.008112Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:09:50.008164Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:50.024131Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:09:50.054051Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:09:50.054087Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:50.066792Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:09:50.106846Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=38 candidates=72 ordinary_horizon=162 paired_horizon=268 use_paired=false
2026-09-12T18:09:50.280731Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:09:50.280779Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:50.301454Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:09:50.301499Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:50.307110Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:09:50.308565Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:09:50.441467Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:09:50.441501Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:50.464808Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:09:50.539774Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=61 candidates=972 ordinary_horizon=528 paired_horizon=2983 use_paired=false
2026-09-12T18:09:50.565240Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:09:50.565284Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:50.572259Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:09:50.695324Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:09:50.695360Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:50.723592Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:09:50.882883Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:09:50.882929Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:50.918601Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:09:50.920691Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:09:50.920730Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:50.963131Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:09:51.138634Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=34 candidates=6561 ordinary_horizon=8541 paired_horizon=6920 use_paired=false
2026-09-12T18:09:51.186954Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:09:51.186994Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:51.201440Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:09:51.819478Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:09:51.845040Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:09:51.845089Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:51.872911Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:09:51.872948Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:51.881009Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:09:51.895288Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:09:51.989499Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:09:51.989548Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:52.072273Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:09:52.328898Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:09:52.328940Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:52.332166Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:09:52.332228Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:52.387510Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:09:52.389314Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:09:52.389348Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:52.432416Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:09:52.437781Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:09:52.591367Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=0 candidates=1692 ordinary_horizon=6634 paired_horizon=5480 use_paired=false
2026-09-12T18:09:52.624041Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:09:52.624069Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:52.635683Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:09:52.908741Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:09:52.908780Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:52.984531Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:09:53.449261Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:09:53.449316Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:53.512815Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:09:55.031949Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:09:55.031992Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:55.127177Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:09:55.305783Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:09:55.305820Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:55.446170Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:09:56.185671Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:09:56.185708Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:56.210410Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:09:56.852042Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:09:57.011937Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:09:57.011977Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:09:57.082646Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:09:57.141678Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=39 success=true
2026-09-12T18:09:57.144544Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:09:57.150805Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:09:57.496716Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: exchange table and repeat patch storage exchange_table_bytes=27916 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:09:59.743296Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=52 success=true
2026-09-12T18:09:59.743348Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10136 exchange_table_bytes=27916 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:09:59.743367Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27916 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10136 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:10:00.385680Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=642 success=true
2026-09-12T18:10:00.394255Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:10:00.395093Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:10:00.401612Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:10:00.401616Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:10:00.404067Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:10:00.405174Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:10:00.412263Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:10:00.413278Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:10:00.413294Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.413690Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:00.414760Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:00.414782Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.415862Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:10:00.417687Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:00.418861Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:00.419038Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:10:00.420314Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:10:00.420858Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:10:00.421350Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:10:00.421996Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:10:00.422006Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.423862Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:10:00.424318Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:10:00.425014Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:10:00.425031Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.427860Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:10:00.429848Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:10:00.429947Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:10:00.430450Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:10:00.430463Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.432362Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:10:00.436842Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:00.437607Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:00.437617Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.439383Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:00.446034Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:10:00.446685Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:10:00.446703Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.448390Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:10:00.453824Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:00.454305Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:10:00.455425Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:10:00.458279Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:10:00.458779Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:10:00.458801Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.466917Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:10:00.475272Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:10:00.475786Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:10:00.475797Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.477355Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:10:00.478522Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:10:00.480735Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:10:00.481082Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:10:00.481091Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.482051Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:10:00.506442Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:10:00.506948Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:10:00.506960Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.507822Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:10:00.508095Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:10:00.508916Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:10:00.508936Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.511343Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:10:00.524856Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:10:00.526565Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:10:00.526579Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.528629Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:10:00.562741Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:10:00.563876Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:10:00.563894Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.566981Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:10:00.571598Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:10:00.577249Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:10:00.577269Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.581640Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:10:00.582144Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:10:00.582153Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.582883Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:10:00.583810Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:10:00.586495Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:10:00.586954Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:00.586968Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.588231Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:10:00.588783Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:10:00.590328Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:10:00.590597Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:10:00.591027Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:10:00.591036Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.592627Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:10:00.616706Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:10:00.619288Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:10:00.619307Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.621474Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:10:00.674058Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:10:00.674093Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:00.689523Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:10:00.720926Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:10:00.720965Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:00.726530Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:10:00.727689Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:10:00.730665Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:00.733687Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:10:00.733711Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.740191Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:00.740230Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.745156Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:10:00.754196Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:00.839887Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:10:00.855452Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:10:00.855499Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:00.877009Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:10:00.979722Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:10:01.004396Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:10:01.004427Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:01.013467Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:10:01.017576Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:10:01.050093Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:10:01.050134Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:01.081045Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:10:01.243189Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:10:01.243259Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:01.272719Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:10:01.276382Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:10:01.287366Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:10:01.287395Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:01.293562Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:10:01.399435Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:01.417522Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:01.417550Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:01.428788Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:01.519485Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:10:01.522322Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:10:01.550744Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:01.550769Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:01.556926Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:10:01.556964Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:01.594949Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:10:01.610951Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:10:01.631872Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:10:01.633237Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:10:01.633268Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:01.634471Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:10:01.920935Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:10:01.970993Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:10:01.971028Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:01.988347Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:10:02.030755Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:10:02.042906Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:10:02.078838Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:10:02.078886Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:02.082282Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:10:02.082345Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:02.096120Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:10:02.131911Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:10:02.440172Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:10:02.480964Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:10:02.481003Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:02.535677Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:10:02.925839Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:10:02.925883Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:02.962680Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:10:03.006261Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:03.008983Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:03.009016Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:03.013256Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:03.331024Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:10:03.445171Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:10:03.445232Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:03.525977Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:10:04.078087Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:10:04.087980Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:10:04.148585Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:10:04.148616Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:04.195095Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:10:04.233540Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:10:04.233572Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:04.382022Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:10:04.823804Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:10:04.827235Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:10:04.911371Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:10:04.911406Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:04.926705Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:10:04.926799Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:04.955464Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:10:04.958042Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:10:04.976534Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:10:04.976553Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:05.000754Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:10:05.009394Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:10:05.009422Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:05.019756Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:10:05.034053Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:10:05.080611Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:10:05.101662Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:10:05.101699Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:05.194393Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:10:05.772678Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:05.807258Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:05.807286Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:05.830824Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:10:05.836780Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:05.855177Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:10:05.855216Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:05.882782Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:10:15.032005Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:10:15.212516Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:10:15.212575Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:15.279542Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:10:15.313133Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=14927 success=true
2026-09-12T18:10:27.264560Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11951 success=true
2026-09-12T18:10:27.288895Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: costed final placed program final_cycles=11838110 final_exchange=4929248
2026-09-12T18:10:28.954406Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=81 success=true
2026-09-12T18:10:29.036361Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=81 success=true
2026-09-12T18:10:29.675544Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=595 success=true
2026-09-12T18:10:29.982390Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: validated search incumbent cycles=11838110 resuming=true
2026-09-12T18:10:30.021961Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: saved mid-plan search state path=artifacts/search-state-20260912/bs1/state.json attempts=24 bytes=19508415
2026-09-12T18:10:30.076141Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: saved mid-plan search state path=artifacts/search-state-20260912/bs1/state.json attempts=24 bytes=19508415
2026-09-12T18:10:40.312702Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-0-480354-0001.json scope="local-24-candidate-0" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:40.391577Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-1-480354-0002.json scope="local-24-candidate-1" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:40.454681Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-2-480354-0003.json scope="local-24-candidate-2" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:40.516606Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-3-480354-0004.json scope="local-24-candidate-3" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:40.581132Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-4-480354-0005.json scope="local-24-candidate-4" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:10:40.646632Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-5-480354-0006.json scope="local-24-candidate-5" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:40.707938Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-6-480354-0007.json scope="local-24-candidate-6" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:40.777565Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-7-480354-0008.json scope="local-24-candidate-7" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:40.839133Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-8-480354-0009.json scope="local-24-candidate-8" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:40.906346Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-9-480354-0010.json scope="local-24-candidate-9" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:40.968882Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-10-480354-0011.json scope="local-24-candidate-10" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:41.035708Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-11-480354-0012.json scope="local-24-candidate-11" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:41.097808Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-12-480354-0013.json scope="local-24-candidate-12" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:41.164409Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-13-480354-0014.json scope="local-24-candidate-13" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:41.227527Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-14-480354-0015.json scope="local-24-candidate-14" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:10:41.295081Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-15-480354-0016.json scope="local-24-candidate-15" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:10:41.366826Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-16-480354-0017.json scope="local-24-candidate-16" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:41.436606Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-17-480354-0018.json scope="local-24-candidate-17" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:41.500625Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-18-480354-0019.json scope="local-24-candidate-18" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:41.564102Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-24-candidate-19-480354-0020.json scope="local-24-candidate-19" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:10:41.564632Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=20 threads=24
2026-09-12T18:10:51.456034Z  INFO local_candidate{attempt=28}: screened exchange table geometry expansion_ms=8439 expansion_and_footprint_ms=9888 estimated_row_bytes=37440 heuristic_row_bytes=106356 geometry_fragments_per_tile=4309 fragment_limit=16384
2026-09-12T18:10:51.619482Z  INFO local_candidate{attempt=28}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:52.424595Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:10:52.425820Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:10:52.444646Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:10:52.445248Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:10:52.445263Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:52.447478Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:10:52.461331Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:10:52.461798Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:10:52.461809Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:52.463139Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:10:52.470090Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:10:52.476659Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:10:52.478218Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:10:52.478977Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:10:52.488831Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:10:52.491744Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:10:52.494324Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:10:52.495374Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:10:52.495391Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:52.498352Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:10:52.577245Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:10:52.581591Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:10:52.581618Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:52.589808Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:10:52.608016Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:10:52.608569Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:10:52.608585Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:52.610082Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:10:52.644146Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:10:52.644882Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:10:52.644896Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:52.646638Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:10:52.657909Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:10:52.658306Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:10:52.658315Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:52.659625Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:10:52.725838Z  INFO local_candidate{attempt=25}: screened exchange table geometry expansion_ms=9828 expansion_and_footprint_ms=11159 estimated_row_bytes=37728 heuristic_row_bytes=106424 geometry_fragments_per_tile=4340 fragment_limit=16384
2026-09-12T18:10:52.874755Z  INFO local_candidate{attempt=25}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:53.162180Z  INFO local_candidate{attempt=39}: screened exchange table geometry expansion_ms=9851 expansion_and_footprint_ms=11590 estimated_row_bytes=37464 heuristic_row_bytes=106432 geometry_fragments_per_tile=4307 fragment_limit=16384
2026-09-12T18:10:53.322722Z  INFO local_candidate{attempt=39}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:53.327984Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:53.346449Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:53.346471Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:53.358385Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:53.389976Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:53.391292Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:53.391309Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:53.393649Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:53.427546Z  INFO local_candidate{attempt=26}: screened exchange table geometry expansion_ms=10624 expansion_and_footprint_ms=11858 estimated_row_bytes=37472 heuristic_row_bytes=106424 geometry_fragments_per_tile=4308 fragment_limit=16384
2026-09-12T18:10:53.501819Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:10:53.507736Z  INFO local_candidate{attempt=42}: screened exchange table geometry expansion_ms=10644 expansion_and_footprint_ms=11934 estimated_row_bytes=37528 heuristic_row_bytes=107328 geometry_fragments_per_tile=4313 fragment_limit=16384
2026-09-12T18:10:53.516173Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:10:53.516213Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:53.523248Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:10:53.546468Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:10:53.547142Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:10:53.547154Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:53.549688Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:10:53.563714Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:10:53.564223Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:53.564235Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:53.565499Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:10:53.571808Z  INFO local_candidate{attempt=26}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:53.572038Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:10:53.577977Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:10:53.628090Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:10:53.630519Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:10:53.630535Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:53.633623Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:10:53.648038Z  INFO local_candidate{attempt=42}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:53.695819Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:53.704427Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:53.704448Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:53.719009Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:53.914643Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:10:53.961816Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:10:53.961849Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:54.016632Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:10:54.029962Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:10:54.038675Z  INFO local_candidate{attempt=32}: screened exchange table geometry expansion_ms=11195 expansion_and_footprint_ms=12470 estimated_row_bytes=37528 heuristic_row_bytes=107220 geometry_fragments_per_tile=4313 fragment_limit=16384
2026-09-12T18:10:54.049762Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:10:54.059108Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:10:54.059130Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:54.061461Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:10:54.061799Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:10:54.061807Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:54.063073Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:10:54.071553Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:10:54.071867Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:10:54.071875Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:54.072692Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:10:54.075807Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:10:54.162280Z  INFO local_candidate{attempt=32}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:54.252934Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:10:54.253321Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:10:54.253332Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:54.254614Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:10:54.261314Z  INFO local_candidate{attempt=30}: screened exchange table geometry expansion_ms=11059 expansion_and_footprint_ms=12693 estimated_row_bytes=37528 heuristic_row_bytes=107220 geometry_fragments_per_tile=4313 fragment_limit=16384
2026-09-12T18:10:54.291111Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:10:54.301674Z  INFO local_candidate{attempt=37}: screened exchange table geometry expansion_ms=11421 expansion_and_footprint_ms=12736 estimated_row_bytes=37640 heuristic_row_bytes=107076 geometry_fragments_per_tile=4319 fragment_limit=16384
2026-09-12T18:10:54.317676Z  INFO local_candidate{attempt=24}: screened exchange table geometry expansion_ms=10975 expansion_and_footprint_ms=12750 estimated_row_bytes=37120 heuristic_row_bytes=106248 geometry_fragments_per_tile=4261 fragment_limit=16384
2026-09-12T18:10:54.362548Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:10:54.383274Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:10:54.383301Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:54.387833Z  INFO local_candidate{attempt=30}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:54.396139Z  INFO local_candidate{attempt=40}: screened exchange table geometry expansion_ms=11107 expansion_and_footprint_ms=12823 estimated_row_bytes=37640 heuristic_row_bytes=107580 geometry_fragments_per_tile=4325 fragment_limit=16384
2026-09-12T18:10:54.411636Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:10:54.446168Z  INFO local_candidate{attempt=37}: eliminated unread FP8 cast input padding clears removed=2084
2026-09-12T18:10:54.484842Z  INFO local_candidate{attempt=24}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:54.549661Z  INFO local_candidate{attempt=40}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:54.609836Z  INFO local_candidate{attempt=43}: screened exchange table geometry expansion_ms=11308 expansion_and_footprint_ms=13036 estimated_row_bytes=37472 heuristic_row_bytes=107328 geometry_fragments_per_tile=4308 fragment_limit=16384
2026-09-12T18:10:54.612321Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:54.625766Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:54.625793Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:54.638443Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:54.666803Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:54.667868Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:54.667886Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:54.670523Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:54.686132Z  INFO local_candidate{attempt=35}: screened exchange table geometry expansion_ms=11848 expansion_and_footprint_ms=13118 estimated_row_bytes=37912 heuristic_row_bytes=107800 geometry_fragments_per_tile=4348 fragment_limit=16384
2026-09-12T18:10:54.704509Z  INFO local_candidate{attempt=41}: screened exchange table geometry expansion_ms=11390 expansion_and_footprint_ms=13132 estimated_row_bytes=37528 heuristic_row_bytes=107328 geometry_fragments_per_tile=4313 fragment_limit=16384
2026-09-12T18:10:54.779234Z  INFO local_candidate{attempt=43}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:54.807370Z  INFO local_candidate{attempt=35}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:54.840284Z  INFO local_candidate{attempt=31}: screened exchange table geometry expansion_ms=11612 expansion_and_footprint_ms=13272 estimated_row_bytes=37528 heuristic_row_bytes=107220 geometry_fragments_per_tile=4313 fragment_limit=16384
2026-09-12T18:10:54.871380Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:54.871440Z  INFO local_candidate{attempt=41}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:54.878743Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:54.878767Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:54.888777Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:54.915620Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:54.957717Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:54.957759Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:54.979762Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:10:54.979795Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:54.997960Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:10:55.003790Z  INFO local_candidate{attempt=31}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:55.014468Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:55.022267Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:10:55.059665Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:10:55.059694Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.063636Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:55.063667Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=4 initial_horizon=496 selected_horizon=496 endpoint_lower_bound=288 lower_bound_gap=208 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:55.066704Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=4 tile=1431 row_words=13 horizon=496
2026-09-12T18:10:55.068651Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:10:55.072071Z  INFO local_candidate{attempt=36}: screened exchange table geometry expansion_ms=11739 expansion_and_footprint_ms=13506 estimated_row_bytes=37912 heuristic_row_bytes=107800 geometry_fragments_per_tile=4348 fragment_limit=16384
2026-09-12T18:10:55.083813Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=5 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:10:55.083833Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=5 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:55.085294Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=5 tile=13 row_words=21 horizon=2978
2026-09-12T18:10:55.091729Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:10:55.105443Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:10:55.105465Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.121191Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:10:55.121231Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:55.126810Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:10:55.145454Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:55.158321Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:55.162164Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:10:55.240828Z  INFO local_candidate{attempt=36}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:55.286149Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:10:55.292076Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:10:55.292101Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.292687Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:10:55.298463Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:10:55.299650Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:10:55.302425Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:10:55.303690Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:10:55.342587Z  INFO local_candidate{attempt=33}: screened exchange table geometry expansion_ms=12064 expansion_and_footprint_ms=13774 estimated_row_bytes=37528 heuristic_row_bytes=107220 geometry_fragments_per_tile=4313 fragment_limit=16384
2026-09-12T18:10:55.362924Z  INFO local_candidate{attempt=27}: screened exchange table geometry expansion_ms=12093 expansion_and_footprint_ms=13794 estimated_row_bytes=37168 heuristic_row_bytes=106392 geometry_fragments_per_tile=4268 fragment_limit=16384
2026-09-12T18:10:55.371637Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:10:55.377613Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:10:55.377634Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.385603Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:10:55.386065Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:10:55.403435Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:10:55.403460Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.414944Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:10:55.420278Z  INFO local_candidate{attempt=38}: screened exchange table geometry expansion_ms=12167 expansion_and_footprint_ms=13854 estimated_row_bytes=37464 heuristic_row_bytes=106432 geometry_fragments_per_tile=4307 fragment_limit=16384
2026-09-12T18:10:55.466187Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:10:55.468036Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:10:55.468050Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.470037Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:10:55.492977Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:10:55.493004Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:55.494749Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:10:55.521663Z  INFO local_candidate{attempt=33}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:55.530185Z  INFO local_candidate{attempt=34}: screened exchange table geometry expansion_ms=12233 expansion_and_footprint_ms=13964 estimated_row_bytes=37912 heuristic_row_bytes=107800 geometry_fragments_per_tile=4348 fragment_limit=16384
2026-09-12T18:10:55.537293Z  INFO local_candidate{attempt=27}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:55.587036Z  INFO local_candidate{attempt=38}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:55.690372Z  INFO local_candidate{attempt=29}: screened exchange table geometry expansion_ms=12412 expansion_and_footprint_ms=14121 estimated_row_bytes=37728 heuristic_row_bytes=107324 geometry_fragments_per_tile=4340 fragment_limit=16384
2026-09-12T18:10:55.698520Z  INFO local_candidate{attempt=34}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:55.709839Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:55.728751Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:55.728776Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.742041Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:55.756514Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:10:55.776312Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:55.776820Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:55.777800Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:55.777815Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.780516Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:55.802217Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:55.802247Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.821571Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:10:55.834839Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:55.846787Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:10:55.851699Z  INFO local_candidate{attempt=29}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:10:55.864879Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:55.865039Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:10:55.865053Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.865873Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:55.865887Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.868683Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:55.874899Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:10:55.879803Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:55.883868Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:55.884512Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:55.884522Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.885920Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:55.893087Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:55.893104Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.902364Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:55.927835Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:55.928842Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:55.928932Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:55.928948Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:55.930873Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:55.938013Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:56.020732Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:10:56.039717Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:10:56.039738Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.065756Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:10:56.068574Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:56.078275Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:56.078294Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.085188Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:10:56.090360Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:56.093020Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:56.103254Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:56.103273Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.112330Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:56.113270Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:10:56.113301Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.137135Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:56.138216Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:56.138229Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.139845Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:56.140343Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:56.144694Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:10:56.147347Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:56.147364Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.158182Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:56.316737Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:56.330180Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:56.330217Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.339416Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:10:56.340056Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:56.345006Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:10:56.345026Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.348663Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:56.351452Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:10:56.355716Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:56.355732Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.365868Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:56.366287Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:56.367354Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:56.367367Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.369279Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:56.464684Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:56.464742Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:56.506284Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:10:56.531996Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:10:56.532502Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:10:56.532516Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.533728Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:10:56.582873Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:56.590411Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:56.590430Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.601010Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:56.706171Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:56.725005Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:56.725030Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.738413Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:56.772747Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:56.774234Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:56.774248Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.776962Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:56.915348Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:10:56.930998Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:10:56.931026Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.946284Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:10:56.960573Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:10:56.971569Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:10:56.971935Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:10:56.971944Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.973405Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:10:56.982364Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:10:56.982704Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:10:56.982711Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:56.983585Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:10:56.988126Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:10:56.989826Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:56.992415Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:10:56.993536Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:10:56.994075Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:10:57.004163Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:10:57.011729Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:57.011761Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.025496Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:57.062533Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:10:57.066450Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:10:57.066465Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.070240Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:57.072650Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:10:57.072774Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:57.073760Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:57.075335Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:57.075354Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.078270Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:57.082416Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:57.082454Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.083677Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:10:57.084015Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:10:57.084022Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.084981Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:10:57.101583Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:57.101612Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.102268Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:57.110659Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:10:57.111707Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:10:57.111731Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.113735Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:10:57.126051Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:10:57.126445Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:10:57.126459Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.127556Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:10:57.139239Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:57.141125Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:57.162844Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:57.162881Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.176032Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:57.179242Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:57.180394Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:57.180412Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.183740Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:57.199960Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:57.200949Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:57.200966Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.203114Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:57.210675Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:57.212114Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:57.212130Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.214730Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:57.260684Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:57.274148Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:57.286657Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:57.311923Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:57.311949Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.350536Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:57.359886Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:57.378797Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:57.378822Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.391747Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:57.392578Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:57.392988Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:57.393443Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:57.393466Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.397516Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:57.400537Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:57.413908Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:57.413944Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.415858Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:57.416735Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:57.416751Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.418319Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:57.434000Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:57.434680Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:57.435782Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:57.435823Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.436231Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:57.436248Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.439141Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:57.475867Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:57.490568Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:57.495947Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:57.516094Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:57.531883Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:10:57.535117Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:57.535141Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.537941Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:57.538430Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:57.548176Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:57.548197Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.549040Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:57.549472Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:10:57.549513Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:57.553750Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:10:57.557849Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:10:57.557873Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.563597Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:57.568104Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:57.568130Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.574552Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:10:57.584248Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:57.585740Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:57.585757Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.588458Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:57.617342Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:57.632558Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:57.633474Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:57.646765Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:10:57.649521Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:10:57.649539Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.652734Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:10:57.653012Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:57.655827Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:57.656819Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:57.656857Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.656946Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:57.656965Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.659857Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:57.675186Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:57.675835Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:57.675846Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.677232Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:57.677242Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:57.714923Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:57.716479Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:57.716496Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.719413Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:57.721910Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:57.732568Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:57.780851Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:57.791027Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:57.791051Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.796781Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:10:57.806118Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:57.808290Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:10:57.808308Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.813777Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:10:57.830914Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:10:57.831455Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:10:57.831467Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.833347Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:10:57.835837Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:10:57.843080Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:10:57.843466Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:57.843476Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.844357Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:10:57.848958Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:10:57.853014Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:10:57.879943Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:10:57.879971Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.895411Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:57.905435Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:57.905458Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.920486Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:57.925254Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:57.950754Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:57.950796Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:57.951922Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:10:57.971346Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:57.991467Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:58.005468Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:10:58.010343Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:58.016139Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:58.016176Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.018161Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:58.018190Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.018609Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:58.020167Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:58.020190Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.023470Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:58.024291Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:10:58.024844Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:10:58.024859Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.026880Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:10:58.028885Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:58.035609Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:58.041111Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:10:58.041621Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:10:58.041637Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.042864Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:10:58.044269Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:58.050303Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:10:58.064220Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:58.064253Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.075274Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:10:58.075858Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:10:58.075867Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.077480Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:10:58.077774Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:58.089686Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:58.091863Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:58.091888Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.096269Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:58.116154Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:58.117913Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:58.120260Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:58.120290Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.125045Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:58.138641Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:58.138669Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.152454Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:58.187782Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:58.189321Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:58.189337Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.192154Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:58.310954Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:10:58.329776Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:10:58.329804Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.343293Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:10:58.378706Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:10:58.380233Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:10:58.380249Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.380307Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:58.383005Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:10:58.389886Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:58.389911Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.405053Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:58.437016Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:58.437668Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:58.447500Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:58.447524Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.447979Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:58.447997Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.463943Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:58.470518Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:58.471492Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:58.498949Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:58.498978Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.508072Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:58.523525Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:58.523553Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.542026Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:58.543816Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:58.558860Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:10:58.590999Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:10:58.591041Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.605199Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:58.607161Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:58.607187Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.612036Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:58.639536Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:10:58.645731Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:58.647546Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:58.647621Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.650852Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:58.686143Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:10:58.696884Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:10:58.696913Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.712745Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:58.712808Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:10:58.726101Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:58.786194Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:58.823424Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:58.823464Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.860076Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:58.871430Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:58.893053Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:58.893080Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.913445Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:58.914856Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:58.914873Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.918805Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:58.939328Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:58.940512Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:58.941492Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:58.941505Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.943669Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:58.990030Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:58.991351Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:58.991368Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:58.994738Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:59.016377Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:59.016649Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:59.017605Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:59.017620Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.019669Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:59.029408Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:59.080914Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:59.087821Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:10:59.094087Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:59.197525Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:10:59.197564Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.286101Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:59.296664Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:59.318019Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:59.318053Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.328821Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:59.328863Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.372019Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:59.380820Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:59.392191Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:59.422134Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:59.423630Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:59.423647Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.427274Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:59.434893Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:59.435802Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:10:59.436565Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:59.436598Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.437184Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:59.437225Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.443688Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:59.449720Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:59.450706Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:59.450721Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.452690Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:59.467717Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:59.468756Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:59.468772Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.470913Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:59.489873Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:59.521697Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:59.525652Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:10:59.525687Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:59.528815Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=27 tile=1452 row_words=15 horizon=3578
2026-09-12T18:10:59.532919Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:59.535374Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:59.535400Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.539858Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:59.541677Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:59.558942Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:59.569218Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:59.570239Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:59.570254Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.572389Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:59.573943Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:59.647113Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:59.652371Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:10:59.660361Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:59.685382Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:10:59.685406Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.729005Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:10:59.747679Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:59.779165Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:59.779191Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.824796Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:59.829010Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:59.862655Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:59.862694Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.865904Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:59.881096Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:10:59.881129Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:10:59.885216Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:10:59.893564Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:10:59.897812Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:59.897833Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.898606Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:10:59.898625Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.902451Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:10:59.905351Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:10:59.907797Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:59.914389Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:10:59.919147Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:10:59.920956Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:10:59.921755Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:10:59.929083Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:10:59.934139Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:10:59.934161Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.941303Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:10:59.941653Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:10:59.941665Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.943557Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:10:59.946401Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:59.949170Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:59.950582Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:59.950600Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.953215Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:10:59.953565Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:10:59.953572Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.954044Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:10:59.954517Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:10:59.956621Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:10:59.959291Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:10:59.963556Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:10:59.964683Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:10:59.965231Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:10:59.969622Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:10:59.975223Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:10:59.975729Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:10:59.976302Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:10:59.976318Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:10:59.979476Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:10:59.982674Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:10:59.994227Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:10:59.996685Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:10:59.996723Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.001225Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:00.003003Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=34 candidates=6561 ordinary_horizon=7923 paired_horizon=6885 use_paired=false
2026-09-12T18:11:00.023161Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:00.024115Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:00.024129Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.026259Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:00.030938Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:00.032341Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:00.032359Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.035854Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:00.047993Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:00.053890Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:00.056582Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:00.057491Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:00.057504Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.058072Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:00.058090Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.059575Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:00.060957Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:00.068120Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:00.068520Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:00.068560Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:00.070823Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:00.083238Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:00.083642Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:00.083659Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.084729Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:00.087455Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:00.094041Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:11:00.100459Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:00.102195Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:00.102234Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.109067Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:00.109783Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:00.109795Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.111135Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:00.120521Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:00.136324Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:00.156725Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:00.171021Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:00.173928Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:00.173948Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.177144Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:00.187054Z  INFO local_candidate{attempt=28}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:00.197293Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:00.198722Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:00.198739Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.202227Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:00.222957Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:00.223852Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:00.223864Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:00.225867Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:00.256063Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:00.256099Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:00.290284Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:00.300134Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:00.319866Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:00.370946Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:00.964462Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:00.991784Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:00.991813Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:01.029586Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:01.195037Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:01.273654Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:01.273702Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:01.305397Z  INFO local_candidate{attempt=25}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:01.375581Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:01.375626Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:01.393666Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:01.408768Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:01.457075Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:01.464631Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:01.475144Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:01.475711Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:01.475726Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:01.477652Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:01.492554Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:01.493335Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:01.493355Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:01.495367Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:01.506027Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:01.531430Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:01.531462Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:01.540320Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:01.541146Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:01.541156Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:01.543534Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:01.614367Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:01.622007Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:01.668023Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:01.668075Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:01.668844Z  INFO local_candidate{attempt=25}: compared ordinary and paired exchange schedules phase=60 candidates=948 ordinary_horizon=531 paired_horizon=2883 use_paired=false
2026-09-12T18:11:01.698445Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:11:01.698474Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:01.705167Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:11:01.720519Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:01.727189Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:01.727224Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:01.729064Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:01.741986Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:01.742005Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:01.743103Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:11:01.842674Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:01.855798Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:01.855822Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:01.886866Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:01.994721Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:01.999586Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:01.999622Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:02.015969Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:02.023573Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:02.023610Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:02.041738Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:02.076878Z  INFO local_candidate{attempt=28}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:02.103921Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:02.106873Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:02.106894Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:02.110049Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:02.195683Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:02.195722Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:02.243111Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:02.545819Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:02.568250Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:02.568276Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:02.595807Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:02.699181Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:02.713915Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:02.713938Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:02.724754Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:02.752126Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:02.753279Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:02.753292Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:02.755121Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:02.958819Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:02.987402Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:02.987430Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:02.988189Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:02.996921Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:02.996945Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:03.009074Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:03.026917Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:03.240617Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:03.276423Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:03.276462Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:03.325251Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:03.354181Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:03.354858Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:03.354870Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:03.356592Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:03.437591Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:03.440736Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:03.440758Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:03.444038Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:03.554608Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:03.618660Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:03.618699Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:03.723434Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:03.795792Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:03.814528Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:03.815082Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:03.815094Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:03.817071Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:03.826983Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:03.830664Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:03.831149Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:03.831161Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:03.832402Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:03.839690Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:03.872977Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:03.873824Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:03.873839Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:03.876287Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:03.885799Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:03.885839Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:03.945812Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:03.956942Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:03.997848Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:04.008733Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:04.012088Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:04.012115Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.028377Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:04.028414Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.036284Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:04.036305Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.050747Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:04.065714Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:04.079628Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:04.112659Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:04.113726Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:04.113744Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.116188Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:04.135609Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:04.136253Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:04.136263Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.138142Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:04.193322Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:04.199946Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:04.199972Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.201572Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:04.208961Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:04.214966Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:04.220716Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:04.229576Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:04.233405Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:04.235007Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:04.249609Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:04.269618Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:04.270120Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:04.270136Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.272861Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:04.285397Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:04.285759Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:04.285770Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.286784Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:04.293198Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:04.299137Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:04.300743Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:04.301538Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:04.314776Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:04.398465Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:04.406328Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:04.406413Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.419664Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:04.436647Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:04.437169Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:04.437182Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.438582Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:04.443383Z  INFO local_candidate{attempt=25}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:04.472055Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:04.473032Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:04.473048Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.475129Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:04.486516Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:04.486909Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:04.486916Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.488234Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:04.556215Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:04.556248Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:04.612444Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:04.919373Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:04.941971Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:04.942003Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:04.970378Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:04.988360Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:04.988400Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:05.010311Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:05.017070Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:05.068468Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:05.068493Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:05.168417Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:05.193932Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:05.193967Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:05.203073Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:05.213104Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-12T18:11:05.213133Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:05.215304Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:05.397961Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:05.420480Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:05.420528Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:05.433024Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:05.471476Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:05.472319Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:05.472343Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:05.476336Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:05.499491Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:05.500119Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:05.500131Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:05.502053Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:05.513359Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:05.522841Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:05.541053Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:05.541639Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:05.541655Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:05.543302Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:05.546292Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:05.573998Z  INFO local_candidate{attempt=32}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:05.605103Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:05.605132Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:05.609644Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:05.690127Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:05.690162Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:05.692956Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:05.753690Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:05.753964Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:05.772652Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:05.773218Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:05.773231Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:05.775137Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:05.787941Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:05.788448Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:05.788461Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:05.789701Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:05.796677Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:05.816275Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:05.816304Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=42 initial_horizon=2459 selected_horizon=2459 endpoint_lower_bound=1188 lower_bound_gap=1271 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:05.818487Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=42 tile=0 row_words=44 horizon=2459
2026-09-12T18:11:05.954377Z  INFO local_candidate{attempt=37}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:06.062690Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:06.069103Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:06.069128Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:06.080944Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:06.080978Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:06.086775Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:06.086796Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:06.114222Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:06.115554Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:06.120002Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:06.162604Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:06.223510Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:06.223554Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:06.296703Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:06.441295Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:06.470275Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:06.470310Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:06.498910Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:06.504134Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:06.510994Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:06.511019Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:06.520258Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:06.532966Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:06.539830Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:06.542463Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:06.543606Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:06.613872Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:06.746662Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:06.746706Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:06.848706Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=30 tile=707 row_words=441 horizon=14541
2026-09-12T18:11:07.259173Z  INFO local_candidate{attempt=30}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:07.301614Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:07.314588Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:07.337356Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:07.337379Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:07.352344Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:07.352394Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:07.376460Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:07.379390Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:07.389852Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:07.397307Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:07.397339Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:07.440663Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:07.442307Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:07.442335Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:07.442982Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:07.443470Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:07.443488Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:07.446590Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:07.451944Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:07.548073Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:07.593253Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:07.594088Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:07.594099Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:07.596244Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:07.769471Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:07.792588Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:07.792613Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:07.821410Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:08.364719Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:08.387285Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:08.387322Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:08.403908Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:08.435671Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:08.459484Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:08.461968Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:08.461996Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:08.462144Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:08.462169Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:08.465408Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:08.508026Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:08.628086Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:08.701575Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:08.701609Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:08.759270Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:08.795451Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:08.827034Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:08.827090Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:08.851036Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:08.851921Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:08.851936Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:08.854462Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:08.867689Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:08.881267Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:08.881299Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:08.895692Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:08.896281Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:08.896293Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:08.897954Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:08.900471Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:08.909687Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:08.924829Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:08.925338Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:08.925353Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:08.926739Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:08.927399Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:08.939929Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:08.940416Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:08.940429Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:08.941581Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:08.948185Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:08.955303Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:08.957738Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:08.958927Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:08.977933Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:09.024351Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:09.057325Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:09.061346Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:09.061365Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.069454Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:09.083091Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:09.083588Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:09.083600Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.084783Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:09.114451Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=59 transfers=2047 maximum_identical_destinations=1
2026-09-12T18:11:09.114482Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=59 initial_horizon=174 selected_horizon=174 endpoint_lower_bound=64 lower_bound_gap=110 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:09.116154Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:09.116184Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.116188Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=59 tile=1112 row_words=38 horizon=174
2026-09-12T18:11:09.165618Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:09.219999Z  INFO local_candidate{attempt=34}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:09.222519Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:09.246514Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=43 transfers=69898 maximum_identical_destinations=1
2026-09-12T18:11:09.246630Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=43 initial_horizon=5672 selected_horizon=5672 endpoint_lower_bound=2816 lower_bound_gap=2856 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:09.283183Z  INFO local_candidate{attempt=24}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:09.287048Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:09.288259Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:09.288284Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.289516Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:09.289544Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:09.291438Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:09.292862Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:09.312856Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=43 tile=163 row_words=515 horizon=5672
2026-09-12T18:11:09.316703Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:09.316726Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.334687Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:09.345097Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:09.345652Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:09.345679Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:09.370799Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:09.393694Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:09.403714Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:09.403766Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.406366Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:09.406400Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:09.444807Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:09.452661Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:09.653466Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:09.653504Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:09.659781Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:09.683033Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:09.683055Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.684343Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:09.700643Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:09.711147Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:09.723878Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:09.723904Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.742191Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:09.742250Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=44 initial_horizon=7065 selected_horizon=7065 endpoint_lower_bound=6756 lower_bound_gap=309 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:09.751745Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=44 tile=64 row_words=135 horizon=7065
2026-09-12T18:11:09.752096Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:09.757106Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:09.765989Z  INFO local_candidate{attempt=41}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:09.770646Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:09.780981Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:09.783777Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:09.784921Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:09.790060Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:09.790081Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.794336Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:09.809614Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:09.810104Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:09.810115Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.812120Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:09.818936Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:09.824414Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:09.824874Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:09.824883Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.826066Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:09.832564Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:09.838439Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:09.839998Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:09.840791Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:09.854115Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:09.951637Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:09.956899Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:09.956927Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.966322Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:09.966382Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:09.971231Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:09.994031Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:09.994868Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:09.994898Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:09.997181Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:10.026266Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:10.048786Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:10.049817Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:10.049834Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:10.052004Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:10.066269Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:10.066838Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:10.066850Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:10.068472Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:10.192608Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:10.274795Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:10.274831Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:10.277401Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:10.316426Z  INFO local_candidate{attempt=35}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:10.325158Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:10.326123Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=34 candidates=6561 ordinary_horizon=7923 paired_horizon=6885 use_paired=false
2026-09-12T18:11:10.337438Z  INFO local_candidate{attempt=26}: compared ordinary and paired exchange schedules phase=60 candidates=972 ordinary_horizon=528 paired_horizon=2983 use_paired=false
2026-09-12T18:11:10.338889Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:10.338915Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:10.353719Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:10.353754Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:10.362800Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=60 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:10.362826Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=60 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:10.368403Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=60 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:10.369958Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:10.369987Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:10.383509Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:11:10.392955Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:10.392979Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:10.394037Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:10.395549Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:10.411468Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:10.411491Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:10.412789Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:11:10.429969Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:10.432150Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:10.432164Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:10.434779Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:10.434914Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:10.455784Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:10.477773Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:10.479007Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:10.479037Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:10.483176Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:10.484113Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:10.484128Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:10.486387Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:10.498185Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:10.498983Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:10.498996Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:10.501253Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:10.524723Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:10.529356Z  INFO local_candidate{attempt=31}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:10.590391Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:10.649146Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:10.649182Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:10.694630Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:10.712455Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:10.712490Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:10.756801Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:10.830614Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:10.863328Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:10.863361Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:10.879595Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:10.891832Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:10.902318Z  INFO local_candidate{attempt=33}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:10.925511Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:10.925535Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:10.965543Z  INFO local_candidate{attempt=27}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:10.989686Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:10.997434Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:11.017734Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:11.017763Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:11.021265Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:11.021282Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.021323Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:11.022877Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:11.027829Z  INFO local_candidate{attempt=36}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:11.036584Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:11.045040Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:11.045078Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.045477Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:11.045493Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.050080Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:11.052530Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:11.053613Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:11.054017Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:11.054028Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.055462Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:11.058382Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:11.063070Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:11.065292Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:11.065643Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:11.065651Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.066578Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:11.071804Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:11.073725Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:11.075297Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:11.075320Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.080323Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:11.080342Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:11.089540Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:11.090387Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:11.090411Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.093533Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:11.104006Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:11.105143Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:11.105189Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.107805Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:11.108617Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:11.115317Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:11.116229Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:11.116253Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.118453Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:11.126392Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:11.132421Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:11.137369Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:11.152576Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:11.152610Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:11.196708Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:11.199966Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:11.334722Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:11.374251Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:11.379574Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:11.379601Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.398157Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:11.398178Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.435372Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:11.437088Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:11.471618Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:11.472333Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:11.472346Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.474096Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:11.478273Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:11.502675Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:11.502696Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.515938Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:11.532497Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:11.538945Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:11.541090Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:11.541115Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.570810Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:11.603268Z  INFO local_candidate{attempt=29}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:11.779402Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:11.779445Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:11.841857Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:11.861177Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:11.876562Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:11.889361Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:11.889396Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.904731Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:11.942226Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:11.942277Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.967485Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:11.970114Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:11.970133Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:11.973483Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:12.034437Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:12.087784Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:12.106427Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:12.106982Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:12.106992Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.109006Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:12.126612Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:12.127440Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:12.127466Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.129539Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:12.130823Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:12.140522Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:12.172035Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:12.172917Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:12.172928Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.175479Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:12.199454Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:12.199483Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.232967Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:12.238079Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:12.285885Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:12.285914Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.291720Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:12.295488Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:12.302111Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:12.302133Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.326400Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:12.335009Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:12.335056Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.344102Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:12.344964Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:12.344978Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.346986Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:12.395331Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:12.404662Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:12.435025Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:12.451124Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:12.451961Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:12.451974Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.454314Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:12.521094Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:12.521130Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.522704Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:12.522740Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:12.542275Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:12.661867Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:12.663430Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:12.700921Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:12.700955Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.703183Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:12.729026Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:12.729065Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.736268Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:12.759733Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:12.777607Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:12.806145Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:12.806180Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.847822Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:12.909081Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:12.909117Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.910953Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:12.916654Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:12.922274Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:12.927667Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:12.927686Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.934625Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:12.943880Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:12.944899Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:12.944929Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.948720Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:12.950540Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:12.954980Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:12.955812Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:12.955826Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:12.957859Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:12.962880Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:12.976113Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:13.010932Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:13.016003Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:13.032482Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:13.036012Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:13.036037Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.036322Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:13.036763Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:13.036772Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.038305Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:13.039808Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:13.048277Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:13.048631Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:13.048639Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.049634Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:13.054583Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:13.076738Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:13.077343Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:13.077356Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.079245Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:13.082550Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:13.082576Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.190444Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:13.198294Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:13.226802Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:13.226830Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.245118Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:13.308672Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:13.312246Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:13.312280Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.317713Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:13.329302Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:13.393770Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:13.393806Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.490760Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:13.496974Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:13.497480Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:13.542085Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:13.542884Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:13.542902Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.545178Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:13.554407Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:13.554431Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.560589Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:13.560611Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.656595Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:13.663676Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:13.700817Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:13.701626Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:13.701639Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.703777Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:13.706906Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:13.707736Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:13.707749Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.709619Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:13.928793Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:13.956242Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:13.956271Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.967125Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:13.983455Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:13.983493Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:13.994262Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:13.999060Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:13.999815Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:14.003356Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:14.032441Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:14.033574Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:14.033762Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:14.033775Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.036528Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:14.060448Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:14.060478Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.064905Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:14.064929Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.099620Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:14.099652Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.150698Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:14.157884Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:14.178414Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:14.194847Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:14.204747Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:14.206191Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:14.206232Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.209265Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:14.209304Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.210379Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:14.245198Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:14.246073Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:14.246085Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.248469Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:14.253172Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:14.285845Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:14.295089Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:14.295110Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.308626Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:14.330932Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:14.345072Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:14.345114Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:14.374221Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:14.374249Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.454648Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:14.461864Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:11:14.531161Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:14.595130Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:14.621599Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:14.621640Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.638793Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:14.638824Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.684383Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:14.724879Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:14.731746Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:14.731771Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.741077Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:14.744321Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:14.744351Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:14.749025Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:14.753501Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:14.760121Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:14.762681Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:14.763806Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:14.775183Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:14.788056Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:14.798857Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:14.799404Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:14.799418Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.801940Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:14.813715Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:14.814831Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:14.814847Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.815349Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:14.815844Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:14.815853Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.817220Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:14.817576Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:14.824101Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:14.830195Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:14.831821Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:14.832614Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:14.836295Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:14.845466Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:14.846427Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:14.846457Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.851138Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:14.851157Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.858182Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:14.867596Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:14.872496Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:14.874324Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:14.875116Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:14.882496Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:14.884338Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:14.885303Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:14.885316Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.887753Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:14.895425Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:14.895804Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:14.895811Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.897758Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:14.900163Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=56 candidates=36 ordinary_horizon=232 paired_horizon=1392 use_paired=false
2026-09-12T18:11:14.907468Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:14.907831Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:14.907838Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:14.908847Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:14.913777Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:14.918094Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:14.919270Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:14.919821Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:14.927054Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:14.930232Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:14.974599Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:14.997047Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:14.997763Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:14.997786Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.000130Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:15.000183Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:15.001815Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:15.005390Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:15.005409Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.006041Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:15.006054Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.012078Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:15.012545Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:15.012557Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.013633Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:15.014040Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:15.015502Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:15.020055Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:15.027093Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:15.027537Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:15.027548Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.028675Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:15.032616Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:15.033158Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:15.033168Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.034600Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:15.047937Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:15.048586Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:15.048597Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.050628Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:15.054424Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:15.055239Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:15.055249Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.056710Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:15.065768Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:15.066081Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:15.066087Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.067148Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:15.070501Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:15.071493Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:15.071514Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.073804Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:15.086504Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:15.086917Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:15.086924Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.088277Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:15.198941Z  INFO local_candidate{attempt=26}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:15.300720Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:15.329245Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:15.329273Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.359555Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:15.359596Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:15.364898Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:15.407647Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:15.408723Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:15.408738Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.411394Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:15.427395Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:15.428060Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:15.428068Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.429644Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:15.430431Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:15.475761Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:15.486258Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:15.683512Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:15.719227Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:15.750532Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:15.750557Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.789229Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:15.789256Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.851397Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:15.852263Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:15.866047Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:15.870601Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:15.870633Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.875778Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:15.882409Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:15.889508Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:15.889529Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.896665Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:15.903023Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:15.914655Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:15.915554Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:15.915568Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.917648Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:15.917796Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:15.918344Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:15.918895Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:15.918921Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.918968Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:15.918979Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.921443Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:15.923264Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:15.929457Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:15.929476Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.932028Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:15.932065Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:15.933460Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:15.933888Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:15.933897Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.935007Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:15.938369Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:15.940712Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:15.944163Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:15.944962Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:15.944980Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.945330Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:15.946927Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:15.952751Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:15.956737Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:15.960210Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:15.964536Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:15.965337Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:15.965734Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:15.965742Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.967161Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:15.976916Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:15.977279Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:15.977288Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.978197Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:15.983178Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:15.983321Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:15.983929Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:15.983943Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:15.986142Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:15.987742Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:15.988936Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:15.989508Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:16.002774Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:16.011188Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:16.011241Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.033583Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:16.042510Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:16.071092Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:16.073926Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:16.078334Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:16.078352Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.083406Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:16.085663Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:16.093157Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:16.094190Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:16.094222Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.096414Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:16.097755Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:16.098132Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:16.098141Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.099217Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:16.100544Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:16.100565Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.101787Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:16.124789Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:16.125524Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:16.125536Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.126965Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:16.137896Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:16.138381Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:16.138397Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.139966Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:16.177385Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:16.177423Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.203906Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:16.279963Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:16.534749Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:16.559708Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:16.587628Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:16.587672Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.620175Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:16.620217Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.642261Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:16.668705Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:16.689835Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:16.708605Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:16.708638Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.710286Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:16.721737Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:16.731216Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:16.732853Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:16.733561Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:16.733581Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.736081Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:16.745903Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:16.746375Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:16.746388Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.747418Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:16.747794Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:16.747806Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.747891Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:16.748769Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:16.754017Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:16.758190Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:16.758587Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:16.758597Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.759588Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:16.764760Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:16.779796Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:16.780527Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:16.780541Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.782621Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:16.789229Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:16.789249Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.790026Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:16.790732Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:16.790744Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.792573Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:16.814369Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:16.864094Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:16.868071Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:16.879117Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:16.879145Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.886548Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:16.907032Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:16.907683Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:16.907696Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.909674Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:16.920980Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:16.921417Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:16.921429Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.922492Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:16.927682Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:16.932120Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:16.937561Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:16.942364Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:16.944139Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:16.944907Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:16.951754Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:16.963321Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:16.963686Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:16.963695Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.965284Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:16.975665Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:16.976032Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:16.976040Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:16.977082Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:16.982224Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:16.986609Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:16.987777Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:16.988350Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:16.997708Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:17.082406Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:17.088503Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:17.088530Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.093459Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:17.099245Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:17.118599Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:17.119192Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:17.119218Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.120902Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:17.133092Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:17.133118Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.162174Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:17.163345Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:17.163367Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.165662Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:17.179648Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:17.180082Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:17.180092Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.181701Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:17.189715Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:17.226332Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:17.226383Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:17.311413Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:17.316251Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:17.380348Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:17.380383Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.384670Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:17.396336Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:17.401801Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:17.401823Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.405827Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:17.405848Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.409893Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:17.420634Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:17.477989Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:17.480439Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:17.480457Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.482396Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:17.482879Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:17.604528Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:17.687238Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:17.687286Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.821053Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:17.899021Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:17.962736Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:17.962769Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:17.986905Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:17.998079Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:17.998102Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.006493Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:18.030965Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:18.031582Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:18.031595Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.033385Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:18.043477Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:18.043862Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:18.043869Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.044766Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:18.049444Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:18.053494Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:18.059146Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:18.165754Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:18.172835Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:18.177974Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:18.210304Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:18.210346Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.235676Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:18.235704Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.244476Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:18.244500Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.251192Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:18.253920Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:18.280368Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:18.280398Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.309016Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:18.309051Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:18.323706Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:18.327387Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:18.333522Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:18.342615Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:18.433357Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:18.461349Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:18.461371Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.470639Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:18.475674Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:18.475696Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.481861Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:18.493345Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:18.563757Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:18.602663Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:18.604569Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:18.604598Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.623499Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:18.623526Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.624363Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:18.646714Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:18.649470Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:18.659365Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:18.659385Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.659489Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:18.659515Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:18.691715Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:18.704381Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:18.739004Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:18.776088Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:18.780655Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:18.780674Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.785182Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:18.803134Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:18.803162Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.848936Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:18.854419Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:18.854440Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.861267Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:18.862021Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:18.867602Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:18.867624Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.870640Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:18.874681Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:18.875538Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:18.877370Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:18.878134Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:18.884071Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:18.888956Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:18.890775Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:18.891571Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:18.898843Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:18.901247Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:18.910823Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:18.911165Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:18.911173Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.913091Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:18.922483Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:18.922826Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:18.922833Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.923674Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:18.923850Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:18.928636Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:18.932962Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:18.934131Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:18.934680Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:18.944668Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:18.944880Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:18.945457Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:18.945470Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:18.947803Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:19.004725Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:19.008486Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:19.008505Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.015056Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:19.027190Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:19.027588Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:19.027597Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.028670Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:19.035378Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:19.053252Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:19.053929Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:19.053940Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.055298Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:19.063558Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:19.099336Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:19.103667Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:19.103701Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.130733Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:19.130767Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.136276Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:19.136305Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.157784Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:19.171994Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:19.189459Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:19.279462Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:19.299723Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:19.305754Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:19.305785Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.313878Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:19.346892Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:19.346920Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.350763Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:19.416210Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:19.416247Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.435399Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:19.479048Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:19.512007Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:19.547645Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:19.547669Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.585527Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:19.599326Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:19.599371Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:19.655125Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:19.867070Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:19.867106Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=13 initial_horizon=12868 selected_horizon=12868 endpoint_lower_bound=11940 lower_bound_gap=928 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:19.891955Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:19.915810Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-12T18:11:19.928481Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:19.928511Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:19.965408Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:19.966454Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:20.023995Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:20.043653Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:20.043689Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.079783Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:20.096227Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:20.100341Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:20.100361Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.103005Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:20.103045Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.114219Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:20.128028Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:20.166882Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:20.169949Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:20.169978Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.173909Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:20.182649Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:20.182682Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.201192Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:20.225856Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:20.225881Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.238250Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:20.244331Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:20.254441Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:20.278885Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:20.303916Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:20.303942Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.334430Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:20.348624Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:20.349027Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:20.349036Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.350500Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:20.360018Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:20.360390Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:20.360400Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.361320Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:20.365502Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:20.366335Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:20.389261Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:20.389882Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:20.389890Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.391524Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:20.407006Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:20.411740Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:20.411765Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.416746Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:20.521119Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:20.584014Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:20.588709Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:20.588742Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.609443Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:20.609476Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.641839Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:20.649155Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:20.684813Z  INFO local_candidate{attempt=29}: compared ordinary and paired exchange schedules phase=60 candidates=948 ordinary_horizon=531 paired_horizon=2883 use_paired=false
2026-09-12T18:11:20.711393Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:11:20.711426Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:20.719402Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:11:20.741326Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:20.743458Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:20.743487Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:20.745394Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:20.760956Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:20.760984Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:20.762036Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:11:20.777660Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:20.797350Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:20.815197Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:20.815247Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.818010Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=41 success=true
2026-09-12T18:11:20.821192Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:20.823404Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:20.823429Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.828127Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:20.851847Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:20.852681Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:20.852709Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:20.866934Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:20.910688Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:20.948896Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:20.948947Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:20.957952Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:11:21.036692Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:21.054534Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:21.054572Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:21.067543Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:21.109335Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:21.110579Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:21.110595Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:21.112658Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:21.176948Z  INFO local_candidate{attempt=25}: exchange table and repeat patch storage exchange_table_bytes=27980 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:21.291158Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:21.291196Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:21.330105Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:21.334807Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:21.380220Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:21.380293Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:21.381170Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:21.395521Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:21.395549Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:21.410559Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:21.410595Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:21.414937Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:21.436673Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:21.444725Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:21.722964Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:21.723001Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:21.755773Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:22.013389Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:22.022780Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:22.048699Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:22.048727Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.089026Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:22.089055Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.093555Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:22.149745Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:22.254276Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:22.259698Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:22.259718Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.266502Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:22.271502Z  INFO local_candidate{attempt=32}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:22.275809Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:22.280686Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:22.282534Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:22.283305Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:22.292111Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:22.301911Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:22.301950Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:22.311328Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:22.311701Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:22.311709Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.313685Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:22.323686Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:22.324040Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:22.324047Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.325035Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:22.329953Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:22.333527Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:22.333553Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:22.334380Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:22.335558Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:22.336099Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:22.339114Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:22.346083Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:22.350695Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:22.358885Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:22.381760Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:22.381789Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.415652Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:22.435120Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:22.441543Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:22.441573Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.451531Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:22.464349Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:22.464759Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:22.464768Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.465843Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:22.477570Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:22.483750Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=59 transfers=2047 maximum_identical_destinations=1
2026-09-12T18:11:22.483766Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=59 initial_horizon=174 selected_horizon=174 endpoint_lower_bound=64 lower_bound_gap=110 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:22.485297Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=59 tile=1112 row_words=38 horizon=174
2026-09-12T18:11:22.517882Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:22.548020Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:22.548044Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.551937Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:22.551970Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.594698Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:22.596078Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:22.626198Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:22.626250Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:22.627858Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:22.629779Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:22.630807Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:22.630820Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.631116Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:22.631131Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.633302Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:22.633351Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:22.633368Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.639930Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:22.649084Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:22.649759Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:22.649768Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.651419Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:22.653554Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:22.659772Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:22.667660Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:22.668882Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:22.672462Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:22.678852Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:22.678869Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.694723Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:22.698362Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:22.708113Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:22.730076Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:22.730113Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.799935Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:22.802003Z  INFO local_candidate{attempt=43}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:22.827066Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:22.840429Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:22.840465Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.843333Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:22.843364Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:22.870479Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:22.870516Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:22.878661Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:22.880890Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:22.889005Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:22.897922Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:22.898393Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:22.898406Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.899907Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:22.908541Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:22.909856Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:22.910214Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:22.910224Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.911151Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:22.916124Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:22.939297Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:22.939926Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:22.939934Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:22.941610Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:22.993971Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:22.994005Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:23.014492Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:23.026626Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:23.059273Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:23.059308Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.097302Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:23.141016Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:23.141051Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:23.173434Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:23.193164Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:23.202034Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:23.202059Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.216739Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:23.222427Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:23.283769Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:23.291283Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:23.291315Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:23.308637Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:23.308665Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.326443Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:23.333835Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:23.470779Z  INFO local_candidate{attempt=43}: compared ordinary and paired exchange schedules phase=60 candidates=972 ordinary_horizon=528 paired_horizon=2983 use_paired=false
2026-09-12T18:11:23.488590Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:23.492363Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=60 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:23.492386Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=60 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:23.493535Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:23.493555Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.498993Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:23.499080Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=60 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:23.499610Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:23.520426Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:23.520449Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:23.522397Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:23.534918Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:23.534934Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:23.536052Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:11:23.567283Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:23.571872Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:23.571901Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.584554Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:23.592873Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:23.592901Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.600779Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:23.618690Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:23.621754Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:23.621778Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.623019Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:23.658999Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:23.663342Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:23.685897Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:23.690489Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:23.690510Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.697540Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:23.697572Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.720181Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:23.725775Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:23.733167Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:23.752458Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:23.752488Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.755439Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:23.755894Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:23.755902Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.757357Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:23.778394Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:23.783086Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:23.788564Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:23.788592Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.794745Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:23.808056Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:23.810185Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:23.810199Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.812522Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:23.868366Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:23.912647Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:23.912689Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.954505Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:23.982165Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:23.989456Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:23.989484Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:23.997753Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:24.074561Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=818 success=true
2026-09-12T18:11:24.074608Z  INFO local_candidate{attempt=25}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10048 exchange_table_bytes=27980 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:11:24.074626Z  INFO local_candidate{attempt=25}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27980 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10048 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:24.123583Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:24.137799Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:24.160142Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:24.160168Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.162722Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:24.162741Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.192310Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:24.192556Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:24.202034Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:24.219259Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:24.219266Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:24.219291Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.219715Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:24.219722Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.220967Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:24.232317Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:24.258254Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:24.258292Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:24.261885Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:24.269984Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:24.271970Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:24.271986Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.274188Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:24.281871Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:24.291604Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:24.301292Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:24.301328Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.308434Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:24.308457Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.334263Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:24.345864Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:24.374785Z  INFO local_candidate{attempt=37}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:24.386462Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:24.425287Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:24.425307Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.434106Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:24.434131Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:24.462273Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:24.464215Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:24.493074Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:24.498195Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:24.498233Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.498271Z  INFO local_candidate{attempt=43}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:24.503800Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:24.567590Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:24.603619Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:24.603644Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.620814Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:24.629378Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:24.629411Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:24.645988Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:24.646010Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.649282Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:24.671677Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:24.679631Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:24.683606Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:24.702813Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:24.702835Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.712992Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:24.740911Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:24.771244Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:24.773392Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:24.773413Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.809522Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:24.813388Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:24.816401Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:24.818974Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:24.818993Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.821225Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:24.821244Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.825873Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:24.826713Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:24.831412Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:24.831545Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:24.831557Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.835334Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:24.836942Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:24.838523Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:24.840179Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:24.840220Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:24.846432Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:11:24.846448Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:24.847434Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:11:24.848289Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:24.848999Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:24.849010Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.850752Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:24.850775Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.850967Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:24.854260Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:24.861469Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:24.864450Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:24.873796Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:24.874153Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:24.874160Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.876121Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:24.885863Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:24.886225Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:24.886236Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.887236Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:24.891145Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:24.891175Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:24.892038Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:24.896396Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:24.897544Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:24.898091Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:24.908400Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:24.909214Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:24.909242Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:24.910922Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:24.913270Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:24.913314Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:24.913338Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.916950Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:24.920156Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:24.923265Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:24.923293Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.927332Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:24.942759Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5710 paired_horizon=11269 use_paired=false
2026-09-12T18:11:24.945320Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:24.950920Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:11:24.981389Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:24.985547Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:24.985564Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:24.992514Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:25.004650Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:25.005023Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:25.005030Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.006138Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:25.025327Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:25.026165Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:25.026189Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:25.030784Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:25.031510Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:25.031521Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.033121Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:25.034898Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:25.041462Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:25.041728Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:25.041733Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.042706Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:25.050125Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:25.050143Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.058414Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:25.058440Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:25.065327Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:25.065794Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:11:25.070098Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:25.070120Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.078259Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:25.084490Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:25.084514Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:25.091458Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:25.104882Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:25.117744Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:25.149214Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1074 success=true
2026-09-12T18:11:25.152924Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:25.152952Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.170418Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:25.178256Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:25.240236Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:25.240262Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.290883Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:25.292602Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:25.296086Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:25.296108Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.301099Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:25.301926Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:25.322676Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:25.323143Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:25.323159Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.327645Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:25.327662Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.334895Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:25.340478Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:25.487774Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:25.524796Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:25.524820Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.564684Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:25.568322Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:25.595565Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:25.595651Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.626820Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:25.722521Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:25.735362Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:25.735385Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.741121Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:25.741156Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:25.741951Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:25.755285Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:25.755323Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:25.759570Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:25.765252Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:25.766272Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:25.766295Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.769505Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:25.785611Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:25.786053Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:25.786062Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.787134Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:25.792522Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:25.795735Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:25.796879Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:25.809928Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:25.842659Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:25.846735Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:25.846764Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.884030Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:25.907751Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:25.908315Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:25.908325Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.909594Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:25.936998Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:25.954191Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:25.954277Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.961568Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:25.967931Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:25.971467Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:25.973824Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:25.973841Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.976419Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:25.983998Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:25.984022Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.995914Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:25.997165Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:25.997178Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:25.999268Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:26.004318Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:26.060530Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:26.060566Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:26.072725Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:26.075048Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:26.075074Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:26.079177Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:26.087639Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:26.109894Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:26.109928Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:26.194506Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:26.209892Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:11:26.220267Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:26.220291Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:26.231511Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:26.241774Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:26.241810Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:26.245947Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:26.245978Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:26.253189Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:26.253248Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:26.256300Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:26.350267Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:26.370709Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:26.370735Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:26.384417Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:26.400127Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:26.405017Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:26.405037Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:26.412180Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:26.662040Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:26.684256Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:26.684281Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:26.711583Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:26.747699Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:26.778539Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:26.778563Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:26.814037Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:26.836906Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:26.837439Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:26.837448Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:26.838874Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:26.959247Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:26.959288Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:26.961719Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:11:26.972505Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:27.008669Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:27.008692Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.014592Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:27.033741Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:27.033761Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.036561Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:27.036589Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:27.047349Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:27.047436Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:27.059328Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:27.092162Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:27.094320Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:27.094335Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.096682Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:27.183054Z  INFO local_candidate{attempt=34}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:27.188504Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:27.207218Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:27.207250Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:27.214327Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:27.214486Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:27.214504Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.241584Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:27.241612Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:27.246964Z  INFO local_candidate{attempt=30}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:27.247444Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:27.269412Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:27.278340Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:27.279437Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:27.279451Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.282016Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:27.297038Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:27.297731Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:27.297742Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.299263Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:27.306043Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:27.306063Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:27.340847Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:27.343529Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:27.353065Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:27.359510Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:27.384626Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:27.384657Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.400820Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:27.417575Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:27.417597Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:27.474668Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:27.474703Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.496116Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:27.496146Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.507771Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:27.507804Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:27.540343Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:27.541138Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:27.547599Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:27.578703Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:27.580360Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:27.581395Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:27.588159Z  INFO local_candidate{attempt=24}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:27.590219Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:27.590237Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.594825Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:27.595223Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:27.595234Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.596640Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:27.611906Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:27.612480Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:27.612505Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.613560Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:27.613959Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:27.621712Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:27.652880Z  INFO local_candidate{attempt=41}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:27.656129Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:27.656159Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:27.657242Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:27.658187Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:27.658218Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.658821Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:27.658846Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.660702Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:27.683153Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:27.683781Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:27.695520Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:27.695543Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.702382Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:27.713828Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:27.713852Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:27.715752Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:27.724186Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:27.725126Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:27.725147Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.742820Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:27.752426Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:27.752448Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.753939Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:27.755169Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:27.779219Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:27.801041Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:27.802487Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:27.802506Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.806274Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:27.941073Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:27.946195Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:27.946239Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:27.952138Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:28.011822Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:28.024675Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:28.024707Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.042539Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:28.068469Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:28.080016Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:28.080043Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.085901Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:28.085939Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:28.096669Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:28.109426Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:28.239147Z  INFO local_candidate{attempt=35}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:28.273372Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:28.273409Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:28.281146Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:28.319992Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:28.320030Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:28.342565Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:28.362503Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:28.403097Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:28.403141Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.470884Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:28.508958Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:28.522525Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:28.522917Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:28.522926Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.524423Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:28.534115Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:28.534481Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:28.534490Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.535431Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:28.540857Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:28.572913Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:28.573590Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:28.573602Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.576011Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:28.637369Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:28.668084Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:28.668109Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.679263Z  INFO local_candidate{attempt=31}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:28.705885Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:28.729964Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:28.730520Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:28.730529Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.731904Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:28.758554Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:28.758585Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:28.759219Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:28.782136Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:28.789308Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:28.792929Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:28.792956Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.793453Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:28.797056Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:28.803851Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:28.803880Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.820037Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:28.820074Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.822601Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:28.843343Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:28.857396Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:28.881271Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:28.881809Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:28.881817Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.883111Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:28.891273Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:28.902787Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:28.902818Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.908587Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:28.908613Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.936585Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:28.937465Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:28.939953Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:28.939969Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:28.942811Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:28.946467Z  INFO local_candidate{attempt=27}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:28.968054Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:29.011607Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:29.011638Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:29.039946Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:29.099844Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:29.131809Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:29.131834Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.151615Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:29.163405Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:29.163441Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.177938Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:29.182257Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:29.187978Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:29.195456Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:29.203620Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:29.203644Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.203719Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:29.204265Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:29.204278Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.205619Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:29.216843Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:29.226694Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:29.226715Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.257786Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:29.260178Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:29.260193Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.262906Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:29.263933Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:29.285402Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:29.287017Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:29.287551Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:29.287561Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.288860Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:29.319325Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:29.319349Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.345341Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:29.348838Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:29.348863Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.353234Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:29.362381Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:29.368160Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:29.373802Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:29.389374Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:29.389401Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.399275Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:29.402137Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:29.403060Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:29.411557Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:29.411580Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.430071Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:29.463551Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:29.463593Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.472480Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:29.491887Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:29.491917Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.500754Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:29.500790Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.536133Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:29.546941Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:29.552516Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:29.552536Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.559459Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:29.568904Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:29.573870Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:29.575720Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:29.576518Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:29.584067Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:29.597059Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:29.597422Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:29.597432Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.598958Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:29.608988Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:29.609355Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:29.609365Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.610326Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:29.615348Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:29.619768Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:29.621462Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:29.622272Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:29.628519Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:29.637031Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:29.637939Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:29.669632Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:29.687832Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:29.688890Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:29.688905Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.691604Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:29.695899Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:29.695926Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.713053Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:29.716985Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:29.717001Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.719541Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:29.720467Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:29.721447Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:29.721461Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.723380Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:29.724177Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:29.724307Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:29.724865Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:29.724890Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.731420Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:29.736829Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:29.737247Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:29.737256Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.738367Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:29.744468Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:29.744492Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.748120Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:29.758680Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:29.763835Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:29.764606Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:29.764617Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.765567Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:29.766031Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:29.768763Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:29.768790Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.774983Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:29.775399Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:29.775422Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.777036Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:29.782770Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:29.782809Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:29.787905Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:29.815963Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:29.821680Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:29.829969Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:29.830407Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:29.830420Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.832256Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:29.842304Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:29.842668Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:29.842676Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:29.843599Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:29.848713Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:29.864311Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:11:29.864340Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:29.866443Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:11:29.962989Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:29.963026Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:29.986716Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:30.076446Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:30.120610Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:30.120661Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.138655Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:30.138687Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:30.145800Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:30.150451Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:30.150482Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:30.167644Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:30.170428Z  INFO local_candidate{attempt=33}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:30.174505Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:30.190552Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:30.191046Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:30.191054Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.192378Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:30.220183Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:30.236616Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:30.252658Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:30.252791Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:30.252820Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:30.255793Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:30.255817Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.258557Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:30.264094Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:30.264126Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.273154Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:30.273184Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.289760Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:30.309645Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:30.328626Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:30.332575Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:30.333101Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:30.333113Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.334427Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:30.345353Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:30.345387Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:30.356313Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:30.396329Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:30.399421Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:30.399446Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.403369Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:30.471787Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:30.471824Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:30.501277Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:30.513709Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:30.513756Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:30.535713Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:30.540745Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:30.540769Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.541627Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:30.547299Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:30.556076Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:30.560899Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:30.562743Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:30.563549Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:30.569584Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:30.570642Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:30.573609Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:30.582384Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:30.582404Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.582646Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:30.582998Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:30.583006Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.584936Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:30.589349Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:30.594737Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:30.595081Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:30.595089Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.596049Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:30.601027Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:30.605020Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:30.605043Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.605363Z  INFO local_candidate{attempt=36}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:30.605450Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:30.606649Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:30.607229Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:30.607930Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:30.609980Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:30.610603Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:30.610613Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.612534Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:30.617100Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:30.623647Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:30.624057Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:30.624066Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.625115Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:30.630421Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:30.636278Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:30.654625Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:30.662972Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:30.663004Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:30.670542Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:30.670587Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:30.678976Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:30.679524Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:30.679534Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.680805Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:30.690604Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:30.690632Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:30.690629Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:30.691082Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:30.691098Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.694259Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:30.694278Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.701046Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:30.703737Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:30.712840Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:30.713230Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:30.713240Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.714291Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:30.720492Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:30.720524Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:30.728672Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:30.728700Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.731415Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:30.731847Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:30.732156Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:30.734500Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:30.734517Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.737029Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:30.739276Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:30.739981Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:30.739991Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.741407Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:30.750196Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:30.750492Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:30.750497Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.751491Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:30.805742Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:30.823232Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:30.823266Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.841680Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:30.844322Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:30.865215Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:30.865238Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.878433Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:30.924365Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:30.976363Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:30.977367Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:30.977381Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:30.980193Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:31.035718Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:31.073781Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:31.073808Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.111526Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:31.185029Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:31.190715Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:31.198920Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:31.198959Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.211888Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:31.211911Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.222387Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:31.225592Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:31.236131Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:31.236168Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.277431Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:31.285863Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:31.316469Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:31.329159Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:31.329195Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.338413Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:31.362268Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:31.362864Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:31.362875Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.364763Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:31.375605Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:31.376005Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:31.376013Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.377001Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:31.377908Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:31.377939Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.382066Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:31.386349Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:31.401722Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:31.404224Z  INFO local_candidate{attempt=42}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:11:31.418371Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:31.418403Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.440844Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:31.544551Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:31.544586Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.553388Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:31.553423Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.564767Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:31.564801Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.571861Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:31.577246Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:31.586421Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:31.588178Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:31.591225Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:31.591253Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.597872Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:31.598375Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:31.602366Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:11:31.641218Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:31.641254Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.647078Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:31.647113Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.677124Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:31.677168Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.689490Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:31.697060Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:31.748181Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:31.748232Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.755283Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:31.858783Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:31.859113Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:31.889902Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:31.889937Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.903291Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:31.910873Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:31.911873Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:31.911886Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.914572Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:31.917262Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:31.917290Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.925226Z  INFO local_candidate{attempt=29}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:31.930864Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:31.935397Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:31.935422Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:31.958230Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:31.983288Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:31.983326Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:31.986990Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:31.987023Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.019792Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:32.025928Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:32.042360Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:32.191433Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:32.216406Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:32.216440Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.261349Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:32.289414Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:32.289939Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:32.289947Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.291215Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:32.355124Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:32.360180Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:32.394342Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:32.394406Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.394679Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:32.394719Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.398934Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:32.416642Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:32.416669Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.435381Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:32.440649Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:32.449443Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:32.464761Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:32.465320Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:32.465330Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.466628Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:32.479772Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:32.479794Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:11:32.479836Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:32.480513Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:32.480524Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.482375Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:32.525283Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:32.528929Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:32.528957Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.533357Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:32.544172Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:11:32.566838Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:32.570099Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:32.570133Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.573689Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:32.626102Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:32.669693Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:32.672904Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:32.672935Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.691417Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:32.691452Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.706535Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:32.714462Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:32.762912Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:32.765339Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:32.765366Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.768711Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:32.918252Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:32.918290Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:32.927195Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:11:32.939100Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:32.944654Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:32.946731Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:32.947563Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:32.949327Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:32.957045Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:32.976958Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:32.977957Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:32.977982Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.980233Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:32.993902Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:32.994836Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:32.995197Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:32.995224Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:32.996303Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:33.001588Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:33.003484Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:33.003515Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.006124Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:33.007368Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:33.007925Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:33.014758Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:33.014775Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.018315Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:33.029223Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:33.040409Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:33.089600Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:33.095651Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:33.095685Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.106770Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:33.127412Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:33.127941Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:33.127956Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.129623Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:33.170607Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:33.171911Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:33.171936Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.174486Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:33.187336Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:33.187658Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:33.187665Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.188794Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:33.221748Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:33.250317Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:33.250363Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:33.267779Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:33.270763Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:33.299638Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:33.299672Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.317487Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:33.336752Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:33.336797Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.447266Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:33.473804Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:33.473828Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.492416Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:33.500953Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:33.529480Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:33.529520Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.531805Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:33.574559Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:33.593812Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:33.603954Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:33.603989Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:33.606306Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:11:33.629876Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:33.629914Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.677745Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:33.702470Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:33.703040Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:33.703048Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.704397Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:33.756884Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:33.759324Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:33.759340Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:33.762133Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:33.781282Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:33.781319Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:33.792715Z  INFO local_candidate{attempt=26}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:33.806830Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:33.813100Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:33.813136Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:33.822696Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:11:33.860903Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:33.860944Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:33.889470Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:33.967042Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:33.967077Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:33.971316Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:33.974549Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:34.007545Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:34.015348Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:34.015378Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:34.022387Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:34.022437Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:34.034170Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:34.044188Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:34.044241Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:34.058157Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:34.059682Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:34.060377Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:34.060389Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:34.063012Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:34.075482Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:34.075947Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:34.075956Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:34.077131Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:34.080750Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:34.082841Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:34.086983Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:34.087012Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:34.087330Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:34.111628Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:34.166816Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:34.187594Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:34.187616Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:34.196765Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:34.200811Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:34.222298Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:34.240767Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:34.240843Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:34.242847Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:34.242879Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:34.244978Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:34.245009Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:34.251428Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:34.259916Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:34.262947Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:34.262975Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:34.265753Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:34.265780Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:34.272978Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:34.276806Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:34.293049Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:34.503260Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:34.503300Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:34.516178Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:34.568507Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:34.700424Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:34.717332Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:34.772319Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:34.772349Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:34.790734Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:34.790783Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:34.849459Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:34.890902Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:34.926192Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:34.926241Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:34.940318Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:34.941783Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:34.941806Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:34.945647Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:34.957250Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:35.064583Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:35.100183Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:35.100229Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:35.107282Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:35.164528Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:35.164564Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.203661Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:35.222306Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:35.272687Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:35.305256Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:35.319536Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:35.319578Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.333011Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:35.333051Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.334193Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:35.346116Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:35.346160Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.376004Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:35.376046Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.400300Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:35.401369Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:35.402946Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:35.402968Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.407648Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:35.425529Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:35.426045Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:35.426053Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.427333Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:35.462315Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:35.488915Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:35.491306Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:35.491322Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.493911Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:35.510567Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:35.515275Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:35.522840Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:35.522867Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.545654Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:35.560498Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:35.560532Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.565785Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:35.566882Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:35.566906Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.569722Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:35.573300Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:35.587308Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:35.587341Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:35.590297Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:35.597674Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:35.598874Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:35.599963Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:35.599977Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.602754Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:35.631573Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:35.647868Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:35.650179Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:35.650233Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.655219Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:35.655907Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:35.655968Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.656549Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:35.657830Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:35.668401Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:35.668763Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:35.668772Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.669742Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:35.674737Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:35.675195Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:35.699372Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:35.700036Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:35.700045Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.701981Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:35.714123Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:35.727692Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:35.728178Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:35.728188Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.729899Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:35.740708Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:35.741083Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:35.741098Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.742099Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:35.747520Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:35.752278Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:35.753528Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:35.754073Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:35.764103Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:35.837540Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:35.840466Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:35.844871Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:35.844889Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.851973Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:35.859271Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:35.859302Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.865427Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:35.865835Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:35.865843Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.866931Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:35.871951Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:35.871985Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:35.874637Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:35.892420Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:35.894569Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:35.895366Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:35.895378Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.896846Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:35.906183Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:35.906511Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:35.906517Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.907591Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:35.908410Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:35.928411Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:35.928442Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:35.928458Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.930696Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:35.930714Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:35.933493Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:35.941236Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:35.944567Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:35.967404Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:11:36.040644Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:36.040690Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:36.096025Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:36.096062Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:36.142491Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:11:36.156372Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:36.224538Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:36.233182Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:36.252327Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:36.252364Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:36.274456Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:36.275464Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:36.275479Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:36.278099Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:36.322608Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:36.322635Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:36.323740Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:36.427093Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:36.451694Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:36.451731Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:36.484748Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:36.484788Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:36.485868Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:36.485890Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:36.488685Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:36.502492Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:36.513790Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:36.513836Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:36.520462Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:36.520505Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:36.544341Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:36.557681Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:36.566020Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:36.567147Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:36.567165Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:36.570078Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:36.580373Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:36.598652Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:36.603801Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:36.603824Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:36.633074Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:36.641651Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:36.641692Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:36.671368Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:36.849931Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:36.849967Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:36.857543Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:36.890595Z  INFO local_candidate{attempt=37}: compared ordinary and paired exchange schedules phase=61 candidates=972 ordinary_horizon=456 paired_horizon=2588 use_paired=false
2026-09-12T18:11:36.914876Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:36.914909Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=61 initial_horizon=456 selected_horizon=456 endpoint_lower_bound=96 lower_bound_gap=360 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:36.923194Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=61 tile=951 row_words=81 horizon=456
2026-09-12T18:11:36.967829Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=62 transfers=2878 maximum_identical_destinations=1
2026-09-12T18:11:36.967869Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=62 initial_horizon=1641 selected_horizon=1641 endpoint_lower_bound=1536 lower_bound_gap=105 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:36.971402Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=62 tile=1221 row_words=20 horizon=1641
2026-09-12T18:11:36.986944Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=63 transfers=1408 maximum_identical_destinations=1
2026-09-12T18:11:36.986965Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=63 initial_horizon=768 selected_horizon=768 endpoint_lower_bound=704 lower_bound_gap=64 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:36.988079Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=63 tile=47 row_words=28 horizon=768
2026-09-12T18:11:36.999389Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:37.010100Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:37.010568Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:37.010577Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.011981Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:37.052814Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:37.052851Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:37.057950Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:37.088740Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:37.357376Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:37.406734Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:37.406769Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.423142Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:37.454438Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:37.467826Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:37.467851Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.503788Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:37.559599Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:37.566095Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:37.566686Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:37.588880Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:37.596076Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:37.596111Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.605760Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:37.605792Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.607947Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:37.610920Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:37.610950Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.614413Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:37.619930Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:37.619960Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.633924Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:37.639381Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:37.639401Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.646389Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:37.646755Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:37.648013Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:37.652438Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:37.652460Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.653646Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:37.656621Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:37.661668Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:37.663077Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:37.663541Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:37.664373Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:37.665233Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:37.665248Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.667782Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:37.677109Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:37.677674Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:37.677683Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.679020Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:37.687139Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:37.687785Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:37.700482Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:37.700899Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:37.700908Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.702498Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:37.713925Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:37.714470Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:37.714487Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.715961Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:37.723748Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:37.730998Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:37.732506Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:37.733037Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:37.733187Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:37.733224Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:37.743667Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:37.747069Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:37.761593Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5710 paired_horizon=11269 use_paired=false
2026-09-12T18:11:37.820433Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:37.824710Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:37.824728Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.830751Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:37.830781Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:37.832874Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:37.846300Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:37.846705Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:37.846714Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.847813Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:37.848701Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:37.848728Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:37.863658Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:11:37.865727Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:37.875177Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:37.876017Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:37.876029Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.877525Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:37.887477Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:37.887801Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:37.887807Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:37.888880Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:37.898184Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:37.898226Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:37.912176Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:38.324140Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:38.330243Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:38.351910Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:38.351934Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.361965Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:38.380682Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:38.409117Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:38.412797Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:38.412821Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.419745Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:38.419771Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.420127Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:38.432000Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:38.457516Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:38.457552Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.460070Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:38.460097Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.470152Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:38.470187Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.471363Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:38.475472Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:38.499184Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:38.504683Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:38.517601Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:38.523178Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:38.525280Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:38.525300Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.525424Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:38.527716Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:38.538258Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:38.538737Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:38.538750Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.540687Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:38.555010Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:38.555559Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:38.555576Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.557109Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:38.561374Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:38.562369Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:38.566836Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:38.568014Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:38.568595Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:38.570142Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:38.570170Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:38.584690Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:38.585497Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:38.586526Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:38.599380Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:38.600517Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:38.604626Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:38.604658Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.606557Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:38.619853Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:38.619879Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.627041Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:38.635023Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:38.635990Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:38.636004Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.638709Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:38.648675Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:38.648772Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:38.649404Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:38.649420Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.651823Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:38.658741Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:38.658768Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.660755Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:38.662909Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:38.663323Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:38.663334Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.664369Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:38.664552Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:38.664566Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.669250Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:38.671220Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:38.673538Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:38.673838Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:38.673862Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:38.683026Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:38.683423Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:38.683433Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.684486Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:38.691323Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:38.691348Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:38.692587Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:38.692613Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.698954Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:38.705216Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:38.715047Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:38.715111Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:38.716522Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:38.716582Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.718711Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:38.737177Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:38.737247Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:38.737412Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:38.760492Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:38.762813Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:38.774726Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:38.774756Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.777604Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:38.791523Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:38.791906Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:38.791916Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.793366Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:38.802917Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:38.803278Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:38.803288Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.804174Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:38.807556Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:38.807583Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.809101Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:38.815234Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:38.815265Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:38.831956Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:38.832605Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:38.832614Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.834521Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:38.854628Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:38.854666Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:38.868475Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:38.868772Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:38.872858Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:38.886318Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:38.886923Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:38.886933Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:38.888249Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:11:38.894061Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:38.894891Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:38.900410Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:38.956420Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:38.956451Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:38.959342Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:11:38.975240Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:39.026835Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:39.027845Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:39.027865Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.030637Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:39.048112Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:39.114649Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:39.114691Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.214249Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:39.216551Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:39.242022Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:39.242059Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.259100Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:39.259940Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:39.259953Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.261993Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:39.274395Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:39.444762Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:39.472963Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:39.490962Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:39.490996Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.491307Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:11:39.491349Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.502125Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:11:39.532809Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:39.533903Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:39.535026Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:39.535052Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.539053Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:39.553566Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:39.554053Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:39.554064Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.555451Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:39.627844Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:39.656041Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:39.659176Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:39.659198Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.682142Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:39.682167Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.695321Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:39.707533Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:39.711325Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:39.718849Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:39.719359Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:39.719375Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.720781Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:39.723552Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:39.723583Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:39.732026Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:39.736227Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:39.736272Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.737334Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:39.776333Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:39.792498Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:39.799531Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:39.800055Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:39.800063Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.801468Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:39.819657Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:39.819679Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.834305Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=30 success=true
2026-09-12T18:11:39.835611Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="compile_kernels"}: compiling kernel source=device/gemm_f16_amp.S name="gemm_f8_interleaved_k192_c32_r2_r2" target=ipu21
2026-09-12T18:11:39.837756Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:39.837782Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.852179Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:39.853537Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:39.853577Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:39.856969Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:11:39.873840Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:39.874313Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:39.874325Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.875376Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:39.877642Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="compile_kernels"}: kernel artifact created object=/srv/home/.cache/ipu-stack/kernels/02995d330319f966f1495987f0ba5ccb8dafa472cd94acedd08b389d311b6b29/kernel.o metadata=/srv/home/.cache/ipu-stack/kernels/02995d330319f966f1495987f0ba5ccb8dafa472cd94acedd08b389d311b6b29/kernel.json
2026-09-12T18:11:39.881042Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=46 success=true
2026-09-12T18:11:39.882126Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:39.889992Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:39.891635Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:39.897660Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:39.897678Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.903923Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:39.917926Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:39.918928Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:39.918945Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:39.921503Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:40.004852Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:40.057353Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:40.058431Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:40.058446Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.061275Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:40.185802Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:40.237709Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:40.237734Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.269328Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:40.289788Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:40.289810Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.304003Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:40.304033Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:40.344316Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:40.356648Z  INFO local_candidate{attempt=37}: exchange table and repeat patch storage exchange_table_bytes=27888 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:40.365657Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:40.366097Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:40.366106Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.367647Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:40.377802Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:40.378166Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:40.378174Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.379253Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:40.384432Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:40.392296Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:40.392334Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:40.407740Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:40.408393Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:40.408403Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.410296Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:40.466750Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:40.475280Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:40.502776Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:40.502811Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.545232Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:40.548494Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:40.594182Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:40.594227Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.628017Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:40.670940Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:40.717089Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:40.721424Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:40.721466Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.726019Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:40.726042Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.733384Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:40.743313Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:40.754833Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:11:40.754859Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:40.755917Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:11:40.757833Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:40.763104Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:40.770661Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:40.783750Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:40.784136Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:40.784145Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.785654Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:40.795859Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:40.796237Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:40.796246Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.797300Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:40.802393Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:40.806844Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:40.808054Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:40.808623Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:40.819363Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:40.831375Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:40.831402Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:40.847173Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:40.894960Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:40.899009Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:40.899028Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.905964Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:40.912369Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:40.916754Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:40.918938Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:40.919395Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:40.919406Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.920313Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:40.920907Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:40.939717Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:40.939741Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.948393Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:40.949162Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:40.949171Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.950632Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:40.959713Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:40.960021Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:40.960026Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.961038Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:40.963884Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:40.963903Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:40.967069Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:40.967096Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:40.972034Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:40.980389Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:40.998846Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:40.999684Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:41.000547Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:41.000567Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.002445Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:41.003654Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:41.025664Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:41.039736Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:41.040148Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:41.040158Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.041670Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:41.049700Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:41.049727Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.085451Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:41.129957Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:41.190518Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:41.190545Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.203341Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:41.203373Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:41.217411Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:41.235016Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:41.235640Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:41.235652Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.237121Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:41.244591Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:41.255978Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:11:41.255998Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:41.257091Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:11:41.257920Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:41.264407Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:41.296436Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:41.296490Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:41.314316Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:41.344426Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:41.397068Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:41.415249Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:41.421275Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:41.421297Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.428503Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:41.438535Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:41.443607Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:41.443691Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:41.445579Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:41.457307Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:41.457349Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.470755Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:41.470795Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.482049Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:41.482079Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.521801Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:41.525300Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:41.551972Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:41.552783Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:41.552798Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.554761Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:41.595568Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=36 success=true
2026-09-12T18:11:41.598863Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:41.611333Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:41.634996Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:41.636654Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:41.645491Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:41.645524Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.656638Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:41.679447Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:41.713077Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:41.718599Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:41.720194Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:41.720232Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.721963Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:41.721991Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.724378Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:41.726366Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:41.726390Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.733252Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:41.753492Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:41.754076Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:41.754087Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.755952Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:41.766871Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:41.767301Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:41.767311Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.768338Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:41.773623Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:41.776530Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:41.778037Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:41.893136Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:41.917306Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:41.917328Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:41.957632Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:41.989855Z  INFO local_candidate{attempt=32}: exchange table and repeat patch storage exchange_table_bytes=27916 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:42.014822Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:42.035771Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:42.035806Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:42.049995Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:42.050021Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.098619Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:42.126355Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:42.127011Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:42.127539Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:42.127552Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.128842Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:42.137509Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:42.143665Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:42.143695Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:42.150652Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:42.151040Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:42.151048Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.152570Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:42.162563Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:42.162920Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:42.162928Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.163913Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:42.169105Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:42.170669Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:42.170704Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:42.170951Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:42.173673Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:42.174865Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:42.175422Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:42.185926Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:42.195914Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:42.195937Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.217862Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:42.222738Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:42.226630Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:42.242458Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:42.242479Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.250272Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:42.251066Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:42.254752Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:42.254767Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.258641Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:42.262642Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:42.278279Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=39 success=true
2026-09-12T18:11:42.281309Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:42.281900Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:42.281916Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.282469Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-12T18:11:42.283682Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:42.291578Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:42.314800Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:42.315556Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:42.315569Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.317353Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:42.326485Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:42.326792Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:42.326798Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.327837Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:42.338734Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:42.341637Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:42.341655Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.345195Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:42.430216Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:42.430251Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:42.460629Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:11:42.473233Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:42.473271Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:42.477475Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:42.512408Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:42.512436Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.544942Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:42.567172Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:42.567741Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:42.567752Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.569125Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:42.586573Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:42.600136Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:42.626345Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:42.626368Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.631590Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:42.631621Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:42.638263Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:11:42.656120Z  INFO local_candidate{attempt=38}: exchange table and repeat patch storage exchange_table_bytes=27996 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:11:42.657432Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:42.688459Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:42.688992Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:42.689001Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.690335Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:42.698675Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:42.729290Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:42.729892Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:42.729900Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.731554Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:42.820355Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:42.848832Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:42.848873Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:42.854017Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:42.854062Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:42.888602Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:42.905667Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:42.910552Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:42.912359Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:42.913101Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:42.939625Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:42.976068Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:42.998940Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:43.011585Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:43.011607Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.017824Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:43.047260Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:43.047290Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.048020Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:43.048672Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:43.048688Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.051080Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:43.062670Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:43.063097Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:43.063113Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.064245Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:43.069711Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:43.073634Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:43.074227Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:43.095831Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=820 success=true
2026-09-12T18:11:43.095870Z  INFO local_candidate{attempt=37}: placing generated tile programs linked_end=383612 host_code_base=383616 host_code_bytes=8892 generated_code_bytes=10112 exchange_table_bytes=27888 executable_ranges=[(378884, 378888), (380620, 380624), (382636, 382640), (383612, 383616), (392576, 524288)]
2026-09-12T18:11:43.095881Z  INFO local_candidate{attempt=37}: allocated package support memory linked_end=383612 profile_bytes=0 exchange_table_bytes=27888 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10112 code_address=392576 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:43.097719Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:43.097737Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.128362Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:43.138802Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:43.145380Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:43.147049Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:43.165617Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:43.165639Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.174550Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:43.174572Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.198371Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:43.202307Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:43.206559Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:43.209449Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:43.214523Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:43.214539Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.220881Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:43.221088Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:43.221599Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:43.221609Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.222912Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:43.227095Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:43.227115Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.228983Z  INFO local_candidate{attempt=24}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:43.229498Z  INFO local_candidate{attempt=24}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:43.229506Z  INFO local_candidate{attempt=24}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.230878Z  INFO local_candidate{attempt=24}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:43.252599Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:43.259768Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=33 success=true
2026-09-12T18:11:43.259950Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=26 success=true
2026-09-12T18:11:43.263002Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:43.263148Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:43.274986Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:43.274986Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:43.277154Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:43.280406Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:43.280441Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.284357Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:43.400348Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:43.405620Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:43.405644Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.409871Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:43.411651Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:43.447764Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:43.447785Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.487760Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:43.551693Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:43.578656Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:43.578679Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.610557Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:43.623543Z  INFO local_candidate{attempt=24}: exchange table and repeat patch storage exchange_table_bytes=27888 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:43.632595Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:43.633089Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:43.633096Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.634461Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:43.636351Z  INFO local_candidate{attempt=30}: exchange table and repeat patch storage exchange_table_bytes=27916 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:43.667783Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=30 success=true
2026-09-12T18:11:43.671019Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:43.680301Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:43.695538Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:43.714578Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:43.714612Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.734861Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:43.787349Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:43.789538Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:43.789569Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:43.813053Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:43.813074Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.836488Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:11:43.843581Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:11:43.845270Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:43.868111Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:43.868598Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:43.868609Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.870225Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:43.879945Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:43.880304Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:43.880313Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.881223Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:43.903549Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:43.903577Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:43.930434Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:11:43.942982Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:43.943019Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:43.975310Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:43.976468Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:43.976483Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:43.979105Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:43.992974Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:43.993005Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:44.024850Z  INFO local_candidate{attempt=41}: exchange table and repeat patch storage exchange_table_bytes=27916 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:44.026316Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:44.027862Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:11:44.028644Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:44.036627Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:44.036643Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:44.040515Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:44.040545Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:44.052347Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:44.052817Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=956 success=true
2026-09-12T18:11:44.067793Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:44.077082Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:44.096555Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=37 success=true
2026-09-12T18:11:44.099657Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:44.104869Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:44.104888Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:44.106894Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:44.118083Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:44.142266Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:44.163834Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:44.164313Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:44.164321Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:44.165542Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:44.195147Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=48 success=true
2026-09-12T18:11:44.198647Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:44.205520Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:44.215657Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:44.215685Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:44.244135Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:11:44.322918Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:44.357765Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:44.357787Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:44.395094Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:44.395139Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:44.398030Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:44.405175Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:11:44.408866Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:44.408890Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:44.410367Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:44.425826Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:44.442916Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:44.442949Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:44.466461Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=31 success=true
2026-09-12T18:11:44.469837Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:44.476341Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:44.476606Z  INFO local_candidate{attempt=43}: exchange table and repeat patch storage exchange_table_bytes=27884 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:44.520674Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:44.604331Z  INFO local_candidate{attempt=27}: exchange table and repeat patch storage exchange_table_bytes=27908 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:44.659990Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:44.662306Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:44.662323Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:44.665013Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:44.675785Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:44.684486Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:44.684521Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:44.733564Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:44.733604Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:44.756859Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:44.756896Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:44.767848Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:11:44.781172Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:44.828397Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:44.869009Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:44.870065Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:44.870079Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:44.871790Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:44.873362Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:44.875942Z  INFO local_candidate{attempt=26}: exchange table and repeat patch storage exchange_table_bytes=27884 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:44.885325Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:44.885344Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:44.895998Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:44.919768Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:44.923615Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:44.924757Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:44.924770Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:44.926778Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:45.002369Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:45.031849Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:45.031873Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.054493Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:45.068043Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:45.074872Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:45.074894Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.082106Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:45.087994Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:45.091189Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:45.091680Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:45.091688Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.093015Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:45.119180Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:45.119223Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.157660Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:45.167855Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:45.182921Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:45.182970Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.200848Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:45.211366Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:45.223863Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:45.224215Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:45.224227Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.225444Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:45.233885Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:45.234190Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:45.234198Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.234939Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:45.239064Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:45.242688Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:45.243720Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:45.244233Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:45.252453Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:45.277991Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:45.278021Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:45.290757Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:11:45.303194Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:45.303250Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:45.306428Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:45.307602Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:45.308094Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:45.308102Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.309434Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:45.309448Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.309488Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:45.315285Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:45.326483Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:45.326799Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:45.326806Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.327721Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:45.349538Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:45.350186Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:45.350194Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.351421Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:45.362123Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:45.362541Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:45.362565Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.364195Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:45.378290Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:45.378703Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1408 maximum_identical_destinations=1
2026-09-12T18:11:45.378712Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=768 selected_horizon=768 endpoint_lower_bound=704 lower_bound_gap=64 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.379629Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=28 horizon=768
2026-09-12T18:11:45.384216Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:45.387933Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:45.390717Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:45.407003Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:45.407936Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=2878 maximum_identical_destinations=1
2026-09-12T18:11:45.407949Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1641 selected_horizon=1641 endpoint_lower_bound=1536 lower_bound_gap=105 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.410426Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1221 row_words=20 horizon=1641
2026-09-12T18:11:45.415608Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:45.435934Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:45.436485Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:45.436493Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.437802Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:45.463770Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=42 success=true
2026-09-12T18:11:45.466932Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:45.467115Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:45.473892Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:45.495719Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:45.495746Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.527005Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:45.631642Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:45.631680Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:45.706278Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:45.727989Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:45.733668Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:45.733712Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.761145Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:45.775916Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:45.798805Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:45.799342Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:45.799351Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.800777Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:45.806494Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:45.809703Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:45.809729Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.810485Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:45.812074Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=45 success=true
2026-09-12T18:11:45.815168Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:45.821903Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:45.832069Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=28 success=true
2026-09-12T18:11:45.835222Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:45.844424Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:45.844638Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:45.849438Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:45.849464Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.855751Z  INFO local_candidate{attempt=35}: exchange table and repeat patch storage exchange_table_bytes=27988 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:45.877141Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:45.877178Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.883188Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:45.899630Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:45.901894Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:45.901911Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.904989Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:45.918380Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:45.942379Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:45.942900Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:45.942924Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.944754Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:45.950747Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:45.956132Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:45.956277Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:45.956305Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.956477Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:45.956497Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.957249Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:45.963772Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:45.970226Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:45.981961Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:45.981982Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=456 selected_horizon=456 endpoint_lower_bound=96 lower_bound_gap=360 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:45.987387Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:45.988560Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=951 row_words=81 horizon=456
2026-09-12T18:11:45.989890Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:45.989908Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.015712Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:46.017839Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:46.164449Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:46.169315Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:46.169335Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.174112Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:46.180704Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:46.195777Z  INFO local_candidate{attempt=34}: exchange table and repeat patch storage exchange_table_bytes=27988 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:46.196873Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:46.197650Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:46.197662Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.199946Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:46.204553Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:46.204570Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.213264Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:46.214390Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:46.214957Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:46.214964Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.216421Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:46.219150Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:46.232120Z  INFO local_candidate{attempt=28}: exchange table and repeat patch storage exchange_table_bytes=27964 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:46.234620Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:46.239241Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:46.239258Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.261054Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:46.272677Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:46.577659Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:46.580767Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:46.605606Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:46.605651Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.608010Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:46.608040Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.624350Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:46.639401Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:46.657164Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:46.662139Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:46.664008Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:46.664875Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:46.704694Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:46.704731Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:46.720217Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:46.722368Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:46.722387Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.724717Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:46.725935Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:11:46.799277Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:46.855099Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:46.855137Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:46.861233Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:11:46.882006Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:46.882039Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.951559Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:46.952045Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:46.952055Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:46.953724Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:46.982304Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:47.009602Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:47.009627Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.062191Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:47.100323Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:47.147996Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:47.168641Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:47.168674Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.172597Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:47.173677Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:47.173702Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.177918Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:47.180191Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:47.185912Z  INFO local_candidate{attempt=42}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:11:47.210632Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:47.215090Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:47.215110Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.221180Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:47.224677Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=2720 success=true
2026-09-12T18:11:47.224696Z  INFO local_candidate{attempt=38}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10156 exchange_table_bytes=27996 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:11:47.224709Z  INFO local_candidate{attempt=38}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27996 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10156 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:47.240468Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:47.266298Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:47.266332Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:47.277286Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:47.277322Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.293471Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:11:47.316325Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:47.356671Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:47.357677Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:47.357696Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.359858Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:47.375481Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:47.377128Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:47.377140Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.382074Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:47.463060Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:47.507808Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:47.515386Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:47.515412Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.525357Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:47.525389Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:47.537505Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:11:47.538501Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:47.538522Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.542449Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1059 success=true
2026-09-12T18:11:47.542471Z  INFO local_candidate{attempt=43}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10084 exchange_table_bytes=27884 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:11:47.542483Z  INFO local_candidate{attempt=43}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27884 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10084 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:47.566704Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:47.588595Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:47.823737Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=599 success=true
2026-09-12T18:11:47.833315Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:47.837729Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:47.856463Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:47.857142Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:47.857159Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.859338Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:47.869284Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:47.870358Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:47.870375Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.873054Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:47.874362Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:47.874387Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:47.874930Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:47.874943Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.876310Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:47.884001Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:47.890140Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:47.891410Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:47.891965Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:47.906458Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:47.988411Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:47.992579Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:47.992597Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:47.998753Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:48.010118Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:48.010497Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:48.010513Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.011420Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:48.034883Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:48.035621Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:48.035634Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.036985Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:48.044822Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:48.045094Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:48.045100Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.046033Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:48.123256Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:48.139996Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:48.160539Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:48.160564Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.169368Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:48.169398Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.192300Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:48.199635Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:48.216903Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:48.224632Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:48.228668Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:48.229510Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:48.245247Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:48.270776Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:48.270802Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.307461Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:48.321066Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1812 success=true
2026-09-12T18:11:48.321091Z  INFO local_candidate{attempt=27}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27908 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:11:48.321104Z  INFO local_candidate{attempt=27}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27908 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:48.427437Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:48.427481Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:48.454661Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:48.454700Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:48.463945Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:48.470329Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:11:48.472724Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:48.494687Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:48.494736Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.530726Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:48.552955Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:11:48.582459Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:48.582500Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.610769Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:48.614283Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:48.616126Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:11:48.616145Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.619307Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:11:48.626593Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:48.626616Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.627522Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:48.641316Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:48.647555Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1105 success=true
2026-09-12T18:11:48.669117Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:48.669506Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:48.669518Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.670346Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:48.673516Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:48.674733Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:48.674748Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.674854Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:48.677034Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:48.678664Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:48.682137Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:48.688699Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:48.692613Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:48.693410Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:48.693425Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.698322Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:11:48.706232Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:48.706625Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:48.706632Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.707622Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:48.710785Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:48.712538Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:48.712555Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.714147Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=880 success=true
2026-09-12T18:11:48.714182Z  INFO local_candidate{attempt=35}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10136 exchange_table_bytes=27988 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:11:48.714196Z  INFO local_candidate{attempt=35}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27988 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10136 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:48.714590Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:48.732512Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:48.732976Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:48.732986Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.734586Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:48.746391Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:48.752187Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:48.764849Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:48.764872Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.765287Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:48.771423Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:48.778334Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:48.785701Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:48.803960Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:48.804658Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:48.804687Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.806996Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:48.818807Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:48.819194Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:48.819222Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.820235Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:48.825150Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:48.829477Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:48.830662Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:48.831193Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:48.835123Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=35 success=true
2026-09-12T18:11:48.838092Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:11:48.841389Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:48.843358Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:48.843844Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:48.843853Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.844793Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:48.844943Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:48.850150Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:48.865884Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:48.869855Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:48.869877Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.872572Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:48.873177Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:48.873185Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.874587Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:48.875123Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:48.901581Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:48.905648Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:48.905665Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.905900Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:48.912096Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:48.923508Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:48.923883Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:48.923891Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.924120Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:48.925024Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:48.944618Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:48.945674Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2047 maximum_identical_destinations=1
2026-09-12T18:11:48.945695Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=174 selected_horizon=174 endpoint_lower_bound=64 lower_bound_gap=110 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.947918Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1112 row_words=38 horizon=174
2026-09-12T18:11:48.983455Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:48.983505Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:48.994769Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:48.994806Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:49.005690Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:49.005729Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.007935Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:49.012301Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:49.012318Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.017760Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:49.025211Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:49.029281Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:49.030886Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:49.056651Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:49.072471Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:11:49.106298Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=5114 success=true
2026-09-12T18:11:49.106335Z  INFO local_candidate{attempt=32}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10136 exchange_table_bytes=27916 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:11:49.106348Z  INFO local_candidate{attempt=32}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27916 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10136 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:49.123488Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:49.149915Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:49.153013Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:49.153037Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.157420Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:49.194308Z  INFO local_candidate{attempt=36}: exchange table and repeat patch storage exchange_table_bytes=27988 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:49.195521Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:49.230797Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:49.230839Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.254329Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:11:49.323516Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:49.336913Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:49.342037Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:49.342061Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.357509Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:49.357533Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.365580Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:49.394641Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:49.427124Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:49.428074Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:49.428090Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.430612Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:49.446103Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:49.446823Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:49.446836Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.448449Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:49.493063Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:49.502793Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:49.536169Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:49.536220Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:49.541626Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:49.546316Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:49.546334Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.548974Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:49.551101Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:49.557688Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:11:49.562945Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:49.562964Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.573556Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:49.601654Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:49.602867Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:49.602881Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.605164Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:49.609565Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:49.616063Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:49.616097Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:49.621618Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:49.621636Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.627694Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:49.645829Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:49.646412Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:49.646424Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.647094Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:11:49.648931Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:49.666025Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:49.666700Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:49.666719Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.668329Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:11:49.673460Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:49.674065Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:49.678401Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:49.694948Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:49.694985Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.699749Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:49.699780Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:49.706395Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:11:49.726478Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:49.781149Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1066 success=true
2026-09-12T18:11:49.828652Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:49.828688Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:49.836040Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:11:49.843716Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:49.853924Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:49.853945Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.865741Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:49.967457Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:49.985994Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:49.986018Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:49.998308Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:50.025509Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:50.036861Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:50.037228Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:50.037238Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.038506Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:50.054192Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:50.091180Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:50.091581Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:50.121493Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:50.121525Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.137940Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:50.137978Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.140668Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:50.140699Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.148556Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:11:50.154019Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1047 success=true
2026-09-12T18:11:50.203294Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:50.208730Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:50.209336Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:50.209357Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:50.210577Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:50.244495Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:11:50.248889Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:50.263091Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:50.263530Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:50.263542Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.265342Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:50.269142Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:11:50.275740Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:50.276117Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:50.276125Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.277314Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:50.285460Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:50.286322Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:50.297887Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:50.298288Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:50.298298Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.300371Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:50.307426Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:50.307449Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.310869Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:50.311264Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:50.311274Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.312243Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:50.317473Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:50.320434Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:50.322104Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:50.323332Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:50.323914Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:50.334137Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:50.338879Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:11:50.364071Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:50.364113Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.406304Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:50.432424Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:50.433248Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:50.433258Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.433491Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:50.435094Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:50.439173Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:50.439198Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.451310Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:50.473134Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:50.473852Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:50.473871Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.475643Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:50.493329Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:50.495927Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:50.495944Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.498926Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:50.527842Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:50.528799Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:50.528813Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.530667Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:50.536084Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:50.541194Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:50.541557Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:50.541564Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.542629Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:50.564629Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:50.564655Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.607810Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:50.650894Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:50.669422Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:50.669457Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.685829Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:50.732905Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:50.735047Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:50.735069Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.739031Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:50.801152Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=2480 success=true
2026-09-12T18:11:50.898306Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:50.921346Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:50.921382Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:50.951483Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:50.975801Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:50.984107Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:51.006029Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:51.006059Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.007275Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:51.007296Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.023471Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:51.042875Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:51.058419Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:51.060167Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:51.060183Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.063710Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:51.141229Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:51.151297Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:51.151322Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.163674Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:51.269382Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:51.271955Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:51.283939Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:51.286320Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:51.286340Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.297862Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:51.297885Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.300113Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:51.300733Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:51.300753Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.305591Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:51.327930Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:51.328663Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:51.328677Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.330021Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:51.330836Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:51.331344Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:51.343084Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:51.343558Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:51.343575Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:51.343584Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.344704Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:51.344843Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:51.344858Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.347315Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:51.350338Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:51.354992Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:51.388622Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:51.394340Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:51.394378Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.450238Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:51.482798Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:51.482835Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.497528Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:51.503954Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:51.503986Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.510856Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:51.541385Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:51.541420Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:51.556863Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:11:51.649303Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:51.697999Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:51.698641Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:51.708730Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:51.708751Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.721472Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:51.751282Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:51.751309Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.781704Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:51.793943Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:51.810695Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:51.810724Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.832402Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:51.842599Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:51.850432Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:51.850470Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:51.858504Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:51.858526Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.869728Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:51.901321Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:51.902249Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:51.902533Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:51.902545Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.904452Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:51.904467Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:51.904623Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:51.907048Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:51.956490Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:11:52.010728Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:52.010761Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:52.023644Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:11:52.035329Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:52.036052Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=38 success=true
2026-09-12T18:11:52.039276Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:52.039687Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:52.046750Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:52.064026Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:52.064051Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.067257Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:52.083879Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:52.083910Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.095905Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:52.098085Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:52.098108Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.136004Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:52.150249Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:52.152375Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:52.153879Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:52.161074Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:52.161259Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:52.161276Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.161669Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:52.161678Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.163252Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:52.165741Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=825 success=true
2026-09-12T18:11:52.165775Z  INFO local_candidate{attempt=36}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10136 exchange_table_bytes=27988 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:11:52.165789Z  INFO local_candidate{attempt=36}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27988 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10136 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:52.172167Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:52.175048Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:52.192053Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:52.195610Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:52.196175Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:52.196183Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.197797Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:52.227388Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:52.227415Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.228020Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:52.230317Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:52.230339Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.232945Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:11:52.261384Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:52.293262Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:52.294481Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:52.294496Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.297195Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:52.312972Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:52.313696Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:52.313706Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.315228Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:11:52.315328Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:52.340968Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:52.341009Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:52.343858Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:11:52.343877Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.360116Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:52.370185Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:52.372741Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:11:52.376773Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:11:52.402284Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:11:52.403075Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:52.403092Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.404593Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:11:52.463767Z  INFO local_candidate{attempt=29}: exchange table and repeat patch storage exchange_table_bytes=27980 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:52.543533Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:52.543569Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:52.551044Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:11:52.556555Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:52.579625Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:52.579648Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.604152Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:52.610385Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:52.630259Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:52.630302Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.646962Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:52.697939Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:52.728685Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:52.728708Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.763354Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:52.806558Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:52.807773Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:52.807788Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.810700Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:52.828108Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:52.828891Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:52.828902Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:52.830599Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:52.878358Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:52.888437Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:53.145688Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=979 success=true
2026-09-12T18:11:53.200318Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:53.227832Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:53.227857Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:53.252502Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:11:53.263024Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:53.295642Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:53.296634Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:53.296648Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:53.298958Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:53.314853Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:53.315506Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:53.315517Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:53.317054Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:53.325195Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:53.325232Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:53.361229Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:11:53.362766Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:53.372554Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:53.401472Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:53.424620Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:53.424659Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:53.446160Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:53.496017Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:53.498215Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:53.498232Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:53.500925Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:53.501393Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:53.501426Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:53.579339Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:11:53.606183Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=7656 success=true
2026-09-12T18:11:53.606227Z  INFO local_candidate{attempt=41}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10136 exchange_table_bytes=27916 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:11:53.606239Z  INFO local_candidate{attempt=41}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27916 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10136 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:53.626585Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:53.626619Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:53.657317Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:11:53.740991Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:53.773783Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:11:53.773812Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:53.818136Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:11:53.829173Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:53.845813Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:53.845844Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:53.871807Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:53.981030Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:53.986273Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:53.986296Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:53.993093Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:11:54.002346Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:54.012817Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:54.013193Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:11:54.013214Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.014043Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:11:54.018657Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:54.020262Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:54.027298Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:54.039775Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:54.040127Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:54.040135Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.041673Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:54.051671Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:54.051815Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:54.052029Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:54.052037Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.053061Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:54.057859Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:54.062421Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:54.064546Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:54.065757Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:54.081410Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:54.095397Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:54.095431Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:54.122267Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:54.122298Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.125512Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:11:54.143942Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:54.147743Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:54.147760Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.154495Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:54.163748Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:54.164751Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:54.165936Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:54.166317Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:54.166326Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.167348Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:54.171513Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:54.177913Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:54.177932Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.187077Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:54.187099Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.187984Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:54.191525Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:54.192248Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:54.192259Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.193599Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:54.202045Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:54.202348Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:54.202357Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.203331Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:54.212303Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:54.215064Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:54.215811Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:54.216195Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:54.216222Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.218307Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:54.224741Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:54.224762Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.247712Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:54.331009Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:11:54.339957Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:54.339990Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.388531Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:54.433945Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:54.468369Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:54.485092Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:54.485125Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.486455Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:54.486484Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.492933Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:54.492956Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.508381Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:54.515445Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:54.517523Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:54.517541Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.517770Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:54.529086Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:54.556471Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:54.589461Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:54.596456Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:54.610695Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:54.611119Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:54.611128Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.612630Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:54.622899Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:54.623292Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:54.623302Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.623829Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1017 success=true
2026-09-12T18:11:54.624336Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:54.659815Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:54.662788Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:54.667552Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:54.667571Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.672612Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:54.712350Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:54.713557Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:54.713571Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.716127Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:11:54.769154Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:54.771226Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:54.771242Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.773720Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:54.867504Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:54.869444Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:54.880053Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:54.880076Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.886664Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:54.905677Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:54.905702Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.906601Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:54.907298Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:54.907310Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.909516Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:54.917320Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:54.920846Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:54.921277Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:54.921287Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:54.922365Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:54.927895Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:54.932395Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:54.944218Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:54.986410Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:54.986437Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.027657Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=692 success=true
2026-09-12T18:11:55.027695Z  INFO local_candidate{attempt=29}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10048 exchange_table_bytes=27980 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:11:55.027712Z  INFO local_candidate{attempt=29}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27980 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10048 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:55.073615Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:55.092246Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:55.115028Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:11:55.132976Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:55.133014Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:55.138828Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:55.139719Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:55.139732Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.141005Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:55.141033Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.141862Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:55.154977Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:55.155427Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:55.155436Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.156690Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:55.158589Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:55.165409Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:55.179126Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:55.179248Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:55.179267Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.179522Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:55.179530Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.181025Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:55.191584Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:55.191945Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:55.191952Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.192949Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:55.196032Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:55.196161Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:55.198482Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:55.203135Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:55.204346Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:55.204894Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:55.212778Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:55.219937Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:55.221111Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:11:55.233910Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:55.234563Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:55.234576Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2459 selected_horizon=2459 endpoint_lower_bound=1188 lower_bound_gap=1271 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.236376Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=44 horizon=2459
2026-09-12T18:11:55.244488Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:55.248405Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:55.248436Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:55.264919Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:55.281468Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:55.281505Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.299135Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:55.299162Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.299310Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:11:55.304225Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:11:55.316858Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:55.322775Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:55.322799Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.328725Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:55.334797Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:55.339932Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:11:55.355590Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:55.356244Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:55.356261Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.357836Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=30 success=true
2026-09-12T18:11:55.358092Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:55.358816Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:55.358836Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:55.360985Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:11:55.367785Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:11:55.386455Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:11:55.396670Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:55.397603Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:55.397618Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.399099Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:55.410787Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:55.411300Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:55.411311Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.413141Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:55.524068Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:55.552285Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:55.552309Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.596418Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:55.623582Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:11:55.629954Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:55.631147Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:55.631164Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.633958Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:55.638784Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:55.638819Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:55.646276Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:11:55.646299Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.650545Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:55.651371Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:55.651389Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.653131Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:55.663129Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:11:55.671373Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:11:55.674055Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:55.690502Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:55.690525Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.699425Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:55.702781Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:55.709813Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:55.727866Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:55.742221Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:55.744318Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:55.744350Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.746303Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:55.746337Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.748398Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:55.754952Z  INFO local_candidate{attempt=31}: exchange table and repeat patch storage exchange_table_bytes=27916 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:11:55.766938Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:55.818418Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:11:55.823265Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:11:55.823289Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.828121Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:11:55.841180Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:55.841234Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:55.850628Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:11:55.867963Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:55.889594Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:55.889617Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.904958Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:11:55.905007Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:55.911410Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:55.934356Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:11:55.969978Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:55.972976Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:55.973000Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:55.976618Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:56.001059Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:56.011678Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:56.011702Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.023527Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=995 success=true
2026-09-12T18:11:56.025103Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:56.071877Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:56.080155Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:11:56.080189Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:56.090868Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:11:56.133161Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:56.133196Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.195861Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:56.200662Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:56.209025Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:56.209047Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.215736Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:56.236481Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:56.237077Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:56.237098Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.239401Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:56.240183Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:56.250448Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:56.250874Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:56.250883Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.251936Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:56.254326Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:56.254745Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:56.254753Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.256148Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:56.257148Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:56.261616Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:56.266062Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:56.266433Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:56.266442Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.267404Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:56.307861Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:56.404842Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:11:56.432577Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:56.432601Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.469792Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:11:56.494083Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:11:56.494604Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:11:56.494614Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.495840Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:11:56.549656Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:11:56.552044Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:11:56.552062Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.554557Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:11:56.667019Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:56.688650Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:56.688679Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.718134Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:11:56.718284Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:56.777836Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:11:56.781417Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:11:56.781445Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.791079Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:11:56.791100Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.801757Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:11:56.807638Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:11:56.839754Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:11:56.840895Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:56.840910Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.842976Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:11:56.847366Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:11:56.856079Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:11:56.893064Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69898 maximum_identical_destinations=1
2026-09-12T18:11:56.893091Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5672 selected_horizon=5672 endpoint_lower_bound=2816 lower_bound_gap=2856 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.898311Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:11:56.898342Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.936997Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:11:56.939774Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=163 row_words=515 horizon=5672
2026-09-12T18:11:56.960500Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:11:56.960524Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:56.976302Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:11:57.040363Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:11:57.063960Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:11:57.066543Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:57.074789Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:57.074808Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:57.077465Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:57.086002Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:57.089401Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:57.097131Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:11:57.108167Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:11:57.108187Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:57.109212Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:57.109247Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:57.109800Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:11:57.115429Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:57.115502Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:11:57.115521Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7065 selected_horizon=7065 endpoint_lower_bound=6756 lower_bound_gap=309 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:57.116438Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:57.116453Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:57.119110Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:57.121958Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:11:57.122839Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=135 horizon=7065
2026-09-12T18:11:57.132881Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:11:57.136057Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:57.136091Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:57.138023Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:11:57.139953Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:11:57.140768Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:11:57.145047Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:57.179900Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:57.180816Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:57.182029Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:57.182043Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:57.184784Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:57.201745Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:57.202473Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:57.202485Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:57.204232Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:57.265925Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:57.277329Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:57.392372Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:57.392409Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:57.405289Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:11:57.420359Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:11:57.515835Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:57.535781Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:57.535806Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:57.549542Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:57.555379Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:57.555417Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:57.595953Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:57.598099Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:57.598117Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:57.600591Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:57.604780Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:11:57.930948Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:11:57.942684Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:57.971716Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:57.971750Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.005674Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:58.029293Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:58.044551Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:58.045061Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:58.045075Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.047043Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:58.058581Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:58.058985Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:58.058996Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.060224Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:58.064270Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:11:58.064303Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:58.065493Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:58.066063Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:58.071231Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:58.072556Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:58.073148Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:58.085631Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:11:58.085637Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:58.092557Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:58.092588Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.114533Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:11:58.134728Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:11:58.134774Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.137387Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:58.169542Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:11:58.170381Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:11:58.170762Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:11:58.170779Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.172078Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:58.173450Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:11:58.176350Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:58.176367Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.183821Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:58.185404Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:11:58.189537Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:11:58.190283Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:11:58.190293Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.191961Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:11:58.196808Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:58.197232Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:58.197242Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.198328Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:58.215280Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:11:58.215305Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.219826Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:11:58.224798Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:58.225657Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:58.225669Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.227455Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:58.236910Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:11:58.237632Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:58.237968Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:58.237974Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.239050Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:58.247037Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:11:58.253037Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:58.253342Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:11:58.260286Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:58.276353Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:58.276383Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.277499Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:58.277523Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:58.308668Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:11:58.313753Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:58.332018Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:58.332050Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.369482Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:11:58.369517Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:58.372780Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=780 success=true
2026-09-12T18:11:58.372815Z  INFO local_candidate{attempt=31}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10136 exchange_table_bytes=27916 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:11:58.372830Z  INFO local_candidate{attempt=31}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27916 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10136 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:11:58.382346Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:11:58.383331Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:11:58.406707Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:11:58.406737Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.421999Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:11:58.426833Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:58.458983Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:11:58.474858Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:11:58.478192Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:11:58.478236Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.483288Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:11:58.494246Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:11:58.494290Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.527057Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:11:58.543607Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:11:58.567711Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:11:58.568285Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:11:58.568295Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.570029Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:11:58.635761Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:11:58.679384Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:58.693073Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:58.693103Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.698578Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:11:58.698610Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.709906Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:58.767883Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:11:58.808684Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:11:58.824692Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:11:58.825400Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:58.825418Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.827881Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:11:58.844608Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:11:58.845242Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:58.845263Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.846896Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:11:58.883745Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:11:58.885559Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:11:58.885580Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.889532Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:11:58.971308Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:58.983506Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:58.983529Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:58.992264Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:59.020073Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:59.020712Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:59.020726Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.022684Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:11:59.033643Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:11:59.034051Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:11:59.034060Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.035088Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:11:59.040327Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:11:59.044732Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:11:59.052238Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:11:59.063583Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:11:59.063966Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:11:59.063975Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.065152Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:11:59.065510Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:11:59.074770Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:11:59.075135Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:11:59.075146Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.076135Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:11:59.081031Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:11:59.085462Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:11:59.086729Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:11:59.087385Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:11:59.097269Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:11:59.126076Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:11:59.126112Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.152110Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:11:59.157092Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:11:59.161180Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:11:59.161198Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.167857Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:11:59.180111Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:11:59.180145Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.186691Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:11:59.187303Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:11:59.187323Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.189031Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:11:59.214882Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:11:59.223629Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:11:59.224448Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:11:59.224468Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.226158Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:11:59.226426Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:11:59.235082Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:11:59.235403Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:11:59.235411Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.236457Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:11:59.273025Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:11:59.273067Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:59.309241Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:11:59.380567Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1007 success=true
2026-09-12T18:11:59.443141Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:11:59.508647Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:11:59.508697Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:59.537220Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:11:59.688854Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:11:59.772281Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:11:59.772319Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.822188Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:11:59.822248Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:11:59.861735Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:11:59.876052Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:11:59.876089Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.878759Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:11:59.893351Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:11:59.906064Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:11:59.923559Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:11:59.929392Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:11:59.930853Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:11:59.930879Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.935135Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:11:59.954673Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:11:59.966896Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:11:59.966921Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.969139Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:11:59.969168Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.973986Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:11:59.993802Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:11:59.994503Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:11:59.994516Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:11:59.996467Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:00.007809Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:00.008256Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:00.008267Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.009410Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:12:00.013220Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:00.014708Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:00.019149Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:12:00.042150Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:00.042785Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:00.042799Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.044285Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:00.056410Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:00.076402Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:00.077602Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:00.077623Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.079112Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:00.080183Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:00.081971Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:00.081993Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.085498Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:00.149925Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:00.149970Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.202532Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:12:00.220188Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:12:00.220242Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.236027Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:12:00.255580Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:00.259239Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:00.269409Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:00.271016Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:12:00.272731Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:00.272756Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.276323Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:12:00.293280Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:00.294012Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:00.294033Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.307269Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:00.307292Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.321395Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:00.322885Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:00.322913Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.326392Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:00.336330Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:00.348659Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:00.359716Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:00.360350Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:00.360363Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.362007Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:00.382090Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:00.390021Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:00.390052Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.421716Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:00.430663Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:00.435539Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:00.435935Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:00.435944Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.437446Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:00.447102Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:00.447461Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:00.447470Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.448410Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:00.449580Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:00.458838Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:00.459242Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:00.459250Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.459765Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:00.459788Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.460521Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:00.471033Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:00.471075Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.488442Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:00.505155Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:00.505829Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:00.506353Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:00.506363Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.507404Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:00.507728Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:00.518462Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:00.518875Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:00.518882Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.520126Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:00.521757Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:12:00.523489Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:00.525966Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:00.530409Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:12:00.530425Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.530688Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:00.532527Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:00.533310Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:00.541726Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:12:00.543585Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:00.550129Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:00.550156Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.558702Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:00.568400Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:00.571197Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:00.588417Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:00.589020Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:12:00.589033Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.590478Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:12:00.597557Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:00.599663Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:00.600252Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:00.600281Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.606082Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:00.640122Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:00.640698Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:00.640708Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.642469Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:00.761831Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:00.790527Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:00.790614Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:00.790640Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.817942Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:00.825075Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:00.857867Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:00.896495Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:00.896528Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:00.930683Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:00.944147Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:00.944182Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:00.967638Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:00.998700Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:01.009956Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:01.013330Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:01.019193Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:01.019230Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.026231Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:01.043057Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:01.043089Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.055513Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:01.055543Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.095567Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:01.099348Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:01.182908Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:01.188293Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:01.197296Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:01.209186Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:01.209229Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.220343Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:01.220379Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.239369Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:01.255388Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:01.257112Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:01.257143Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.311796Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:01.311833Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:01.320585Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:01.324242Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:01.337796Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:01.337833Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:01.341568Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:01.345084Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:01.345105Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.351738Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:01.372132Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:01.377914Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:01.383407Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:01.389295Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:01.389488Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:01.389768Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:01.389779Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.391387Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:01.397247Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:01.397279Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.402050Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:01.402453Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:01.402464Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.403491Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:01.404867Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:01.405373Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:01.412189Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:01.424557Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:01.424952Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:01.424962Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.426491Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:01.431940Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:01.436379Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:01.436744Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:01.436752Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.437408Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:01.437436Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.437769Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:01.443002Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:01.443524Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:01.447566Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:01.448739Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:01.449304Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:01.459511Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:01.521928Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:01.521967Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:01.526695Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:01.526725Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:01.534518Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:01.535742Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:01.539739Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:01.539755Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.547827Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:01.560946Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:01.561356Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:01.561366Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.562522Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:01.570261Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:01.574516Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:12:01.589014Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:01.589815Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:12:01.589828Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.591625Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:12:01.601056Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:01.601078Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.624848Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:01.645694Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:12:01.658237Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:01.658271Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.677933Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:12:01.679106Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:12:01.679121Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.681925Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:12:01.685331Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:01.691510Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:01.691541Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:01.698175Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:12:01.698907Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:12:01.698918Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.700606Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:12:01.714988Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:01.745792Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:12:01.755963Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:12:01.761996Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:01.840234Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:01.840269Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.842587Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:01.847468Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:01.847489Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.852929Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:01.862732Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:01.879569Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:01.879603Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:01.886380Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:01.888657Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:01.888689Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.892735Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:01.907979Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:01.911088Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:12:01.943111Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:01.943144Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.968110Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:01.970379Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:01.970395Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:01.972024Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:01.973510Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:01.982364Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:02.107467Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:02.107509Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:02.113183Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:02.141674Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:02.156052Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:02.178631Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:02.178668Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.181057Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:02.181094Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:02.185249Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:02.185284Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.229912Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:02.237929Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:02.274468Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:02.275637Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:02.275654Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.278529Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:02.292164Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:02.300496Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:02.317438Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:02.331994Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:12:02.332026Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.336955Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:02.336980Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.338976Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:12:02.364284Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:02.365503Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:02.365531Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.369651Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:02.388439Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:02.388481Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:02.388981Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:02.388997Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.390341Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:12:02.396677Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:02.402548Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:02.449267Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:02.530855Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:02.545668Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:02.551661Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:02.551683Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.558107Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:02.558138Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.558756Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:02.568103Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:02.572926Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:02.574714Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:02.575497Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:02.583500Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:02.583531Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:02.583686Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:02.586941Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:02.647858Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:02.647885Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.662826Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:02.664183Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:02.689068Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:02.689117Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.690372Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:02.706774Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:02.725820Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:02.741455Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:02.741494Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:02.793271Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:03.014100Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:03.014137Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:03.032595Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:03.053263Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:03.053832Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:03.053841Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.055196Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:03.248577Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:03.248627Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:03.277728Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:03.432938Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:03.443787Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:03.443832Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:03.452458Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:03.463096Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:03.463122Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.468780Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:03.468813Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:03.503792Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:03.505503Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:03.530321Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:03.530845Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:03.530854Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.532221Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:03.586864Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:03.597268Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:03.599684Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:03.599701Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.602361Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:03.616662Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:03.616691Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.649717Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:03.760544Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:03.784221Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:03.784258Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.801683Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:12:03.802748Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:03.832264Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:03.832288Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.853043Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:03.855379Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:03.855396Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.858155Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:03.864868Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:03.868936Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:03.893397Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:03.893956Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:03.893970Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.895351Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:03.908482Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:03.908507Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.948447Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:03.955861Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:03.959246Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:03.959272Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:03.963580Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:03.994451Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:04.018546Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:04.018576Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.035549Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:04.046429Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:04.117332Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:04.117367Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.141729Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:04.141765Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:04.162506Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:04.226033Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:04.273750Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:04.274716Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:04.274729Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.277128Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:04.325603Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:04.344503Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:04.365008Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:04.365032Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.379411Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:04.425948Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:04.435010Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:04.436655Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:04.436681Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.449040Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:04.449070Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:04.457343Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:04.487858Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:04.487901Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.495778Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:04.496990Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:04.497006Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.499726Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:04.505940Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:04.523612Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:04.550155Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:04.550626Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:04.550636Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.552006Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:04.566507Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:04.574428Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:04.599518Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:04.599541Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.630192Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:04.658909Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:04.658946Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.709059Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:04.734543Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:04.736559Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:04.747171Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:04.747196Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.757457Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:04.765304Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:04.775664Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:04.775691Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.775800Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:04.775818Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.813088Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:04.813980Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:04.813995Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.816192Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:04.826878Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:04.844357Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:04.860522Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:04.876463Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:04.876501Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.901106Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:04.915863Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:04.916309Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:04.916321Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.917866Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:04.918695Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:04.932656Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:04.933230Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:04.933251Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.934543Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:04.939781Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:04.969741Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:04.970909Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:04.970935Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:04.974027Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:05.010370Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:05.037467Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:05.037494Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.069760Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:05.114178Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:05.114235Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:05.158391Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:05.161808Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:05.161837Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.162814Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:05.165283Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:05.201629Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:05.234976Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:05.235020Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:05.268273Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:05.299631Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:05.300152Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:05.300160Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.301511Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:05.341805Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:05.407947Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:05.407983Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:05.434598Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:05.441640Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:05.475914Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:05.475937Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.513405Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:05.527592Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:05.541306Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:05.541840Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:05.541850Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.543126Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:05.549650Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:05.549666Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.563113Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:05.563425Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:05.563938Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:05.563950Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.565965Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:05.628262Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:05.639912Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:05.639936Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.655874Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:05.665743Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:05.694133Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:05.694160Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.729562Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:05.793529Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:05.793565Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:05.826102Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:05.844109Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:05.889588Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:05.895259Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:05.895282Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.902541Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:05.906633Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:05.906665Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:05.912115Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:05.916980Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:05.918783Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:05.934536Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:05.937236Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:05.937965Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:05.937976Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:05.940146Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:05.997932Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:06.055842Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:06.079806Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:06.079830Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.089844Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:06.089868Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.110621Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:06.196560Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:06.248411Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:06.248451Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:06.264150Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:06.289455Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:06.289490Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.305732Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:06.327578Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:06.327603Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.328417Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:06.379255Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:06.380278Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:06.380292Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.382711Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:06.383252Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:06.384863Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:06.384885Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.389454Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:06.389920Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:06.431292Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:06.463226Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:06.469473Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:06.518531Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:06.518568Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:06.522305Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:06.522336Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.536560Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:06.559185Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:06.562561Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:06.562583Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.567472Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:06.585438Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:06.585473Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:06.588615Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:06.591007Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:06.596557Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:06.596582Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.599510Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:06.625435Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:06.631359Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:06.643418Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:06.646174Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:06.646624Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:06.646636Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.648111Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:06.659822Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:06.660472Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:06.660512Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.662084Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:06.670219Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:06.696736Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:06.697461Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:06.697473Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.699470Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:06.748053Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:06.751999Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:06.752026Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:06.755066Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:06.755089Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.761050Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:06.798673Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:06.817595Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:06.843023Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:06.844693Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:06.844725Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:06.854192Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:06.854236Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.881843Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:06.889553Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:06.917732Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:06.917767Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.938036Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:06.964589Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:06.964612Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:06.967681Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:06.994297Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:07.041159Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:07.041196Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:07.047500Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:07.047533Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:07.048977Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:07.079059Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:07.119944Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:07.146002Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:07.146026Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.163394Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:07.163433Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:07.175081Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:07.194479Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:07.207342Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:07.207741Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:07.207760Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.209621Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:07.219838Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:07.220228Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:07.220240Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.221293Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:07.226183Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:07.230579Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:07.231732Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:07.232301Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:07.241392Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:07.242699Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:07.246189Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:07.284263Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=21641 success=true
2026-09-12T18:12:07.284303Z  INFO local_candidate{attempt=30}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10136 exchange_table_bytes=27916 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:12:07.284316Z  INFO local_candidate{attempt=30}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27916 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10136 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:12:07.291569Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:07.291600Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.329542Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:07.330542Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:07.333713Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:07.339033Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:07.339060Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.349014Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:07.367694Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:07.368314Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:07.368328Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.369917Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:07.373093Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:07.398419Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:07.398445Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.410306Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:07.411375Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:12:07.411392Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.412360Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:07.413760Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:12:07.423862Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:07.423883Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.427477Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:07.427946Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:12:07.427955Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.429549Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:12:07.446064Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:07.446234Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:07.446274Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.502444Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:07.539620Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:07.540126Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:07.540136Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.541328Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:12:07.546850Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:07.551456Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:12:07.554272Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:07.556998Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:07.561769Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:07.563583Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:07.564356Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:07.574358Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:07.574747Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:07.574754Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.576152Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:07.591442Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:07.591963Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:07.591973Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.594370Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:07.616369Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:07.617137Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:07.617149Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.618823Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:07.619500Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:07.664785Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:07.664821Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.706058Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:07.733162Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:07.742552Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:07.749392Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:07.750637Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:07.751980Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:07.751995Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.755029Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:07.755055Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:07.755068Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.762520Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:07.769907Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:07.769928Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.803679Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:07.813780Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:07.814372Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:07.814412Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:07.825499Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:07.825524Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.828529Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:07.856867Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:07.856899Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.892305Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:07.894397Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:07.894413Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.895087Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:07.896762Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:07.921999Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:07.922601Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:07.922611Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:07.924072Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:07.927009Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:07.987819Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:07.992419Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:07.992444Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:08.054593Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:08.128056Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:08.128838Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:08.141922Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:08.154057Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:12:08.154078Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:08.158981Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:08.159003Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:08.160499Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:12:08.195907Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:08.195933Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:08.196673Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:08.261432Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:08.277793Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:08.280508Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:08.280531Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:08.292747Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:08.295193Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:08.312588Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:08.312609Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:08.337361Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:08.355735Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:08.386425Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:08.386459Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:08.399928Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:08.418985Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:08.458101Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:08.458130Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:08.545388Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:08.763347Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:08.763383Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:08.801018Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:09.013145Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:09.075821Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:09.075854Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:09.082634Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:09.139851Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:09.139894Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:09.167794Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:09.191986Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:09.314772Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:09.376921Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:09.376965Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:09.431089Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:09.617067Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:09.617103Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:09.706100Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:09.779699Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:09.779736Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:09.810335Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:09.830983Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=22895 success=true
2026-09-12T18:12:09.831060Z  INFO local_candidate{attempt=26}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10048 exchange_table_bytes=27884 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:12:09.831389Z  INFO local_candidate{attempt=26}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27884 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10048 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:12:09.838881Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:09.874747Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:09.937785Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:09.937813Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:09.951879Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:09.951919Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:10.001785Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:10.033729Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:10.057028Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=21855 success=true
2026-09-12T18:12:10.057077Z  INFO local_candidate{attempt=28}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10156 exchange_table_bytes=27964 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:12:10.057095Z  INFO local_candidate{attempt=28}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27964 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10156 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:12:10.060282Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=21412 success=true
2026-09-12T18:12:10.094565Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=35 success=true
2026-09-12T18:12:10.097485Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:12:10.105876Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:12:10.269803Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:10.269839Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:10.291243Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:10.319406Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:10.320558Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:10.325716Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:10.325734Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.352575Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:10.357351Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:10.372883Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=541 success=true
2026-09-12T18:12:10.374785Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=22184 success=true
2026-09-12T18:12:10.374812Z  INFO local_candidate{attempt=34}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10136 exchange_table_bytes=27988 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:12:10.374824Z  INFO local_candidate{attempt=34}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27988 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10136 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:12:10.375613Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=17229 success=true
2026-09-12T18:12:10.375848Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=19574 success=true
2026-09-12T18:12:10.377588Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:10.381929Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:10.381959Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:10.391358Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:10.392698Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:10.393468Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:10.393485Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.395459Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:10.399607Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:12:10.400815Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:12:10.400829Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.403416Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:12:10.404940Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:10.405899Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:10.405915Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.407129Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:10.407150Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.408420Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:10.410839Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:10.411661Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:10.411678Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.414773Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:10.418034Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:10.419445Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:12:10.420110Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:12:10.420118Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.421873Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:12:10.431158Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:10.431708Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:10.431722Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.433356Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:10.440843Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:10.447443Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:10.449097Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:10.449828Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:10.463789Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:10.464189Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:10.468119Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:10.468508Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:10.468521Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.469515Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:10.470225Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:12:10.473649Z  INFO local_candidate{attempt=40}: exchange table and repeat patch storage exchange_table_bytes=27948 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:12:10.473999Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:10.480656Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:12:10.481312Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:10.493989Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:10.494476Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:10.494487Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.495807Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:10.555889Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:10.557977Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:10.560623Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:10.566547Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:10.566565Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.577502Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:10.580273Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:10.596277Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:10.596839Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:10.596851Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.598532Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:10.611620Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:12:10.621594Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:10.622304Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:12:10.622324Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.622586Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2047 maximum_identical_destinations=1
2026-09-12T18:12:10.622602Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=174 selected_horizon=174 endpoint_lower_bound=64 lower_bound_gap=110 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.624836Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1112 row_words=38 horizon=174
2026-09-12T18:12:10.631020Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:10.642374Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:12:10.662902Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:10.684480Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:10.685061Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:10.685075Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.686533Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:10.686551Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.686773Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:12:10.689279Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:10.694612Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:10.694783Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:10.695253Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:10.695266Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.696651Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:10.696665Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.699467Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:10.700458Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:10.700483Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.701897Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:10.702230Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:10.714147Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:10.718631Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:10.719188Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:10.719197Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.721528Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:10.726228Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:10.739102Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:10.739508Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:10.739518Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.741520Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:10.776900Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:10.779323Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:10.779339Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.781745Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:10.790582Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:10.811087Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=25269 success=true
2026-09-12T18:12:10.811113Z  INFO local_candidate{attempt=24}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27888 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:12:10.811129Z  INFO local_candidate{attempt=24}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27888 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:12:10.941658Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:10.963311Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:10.963333Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:10.966375Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:10.989170Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:11.060442Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:11.060468Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.137243Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:11.142493Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:11.142516Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.147909Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:11.172220Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:11.177332Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:11.177364Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:11.181665Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:11.196173Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:11.196220Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.203533Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:11.203554Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.204120Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:11.214891Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:11.231809Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:11.233727Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:11.251969Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:12:11.267089Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=23443 success=true
2026-09-12T18:12:11.271832Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:12:11.271869Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.289148Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:12:11.326435Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:12:11.327737Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:11.327751Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.330410Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:12:11.357903Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:11.357938Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:11.364958Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:11.420832Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:11.434430Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:12:11.434453Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.444340Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1017 row_words=95 horizon=528
2026-09-12T18:12:11.468647Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:11.469163Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:11.469171Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.470543Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:11.543035Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:11.544065Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:11.544080Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.546422Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:11.549488Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1174 success=true
2026-09-12T18:12:11.549741Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:11.559412Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:11.559433Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.571913Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:11.576540Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:11.586029Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:11.586679Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:11.586701Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.588115Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:11.588719Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:11.594481Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:11.599603Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:11.600021Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:11.600029Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.601281Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:11.604009Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:11.607191Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:11.616891Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:11.616949Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:11.618250Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:11.618275Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.619050Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:11.619950Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:11.620805Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:11.632952Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:11.635111Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:11.641479Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:11.641506Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.655524Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:11.655553Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.660286Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:11.660318Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:11.673290Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:11.674190Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:12:11.691218Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:11.694064Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:11.702849Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:11.704669Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:11.705053Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:12:11.705061Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.705878Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:12:11.707718Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:11.707734Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.710491Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:11.712003Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:11.714481Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:11.728415Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:11.728892Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:11.728900Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.730085Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:11.743345Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:11.744587Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:12:11.757320Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:11.758119Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:12:11.758131Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.759729Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:12:11.773421Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:11.773906Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:12:11.773918Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.775080Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:11.775116Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.775694Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:12:11.782786Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:11.782823Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.814581Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:11.818456Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:12:11.837052Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:11.837530Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:11.837542Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.838225Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:11.838652Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:11.838662Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.839028Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:11.839642Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:11.849933Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:11.855271Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:11.855289Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.859344Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:11.861485Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:11.869335Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:11.871095Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:11.871529Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:11.871540Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.872642Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:12:11.873731Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:12:11.878877Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:11.880974Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:11.880988Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:11.883425Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:12.007706Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:12.035326Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:12.035350Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.076769Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:12.318972Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:12.367262Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:12.367296Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.400225Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:12.448695Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:12:12.457375Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:12.457411Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:12.465815Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:12:12.465840Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.477494Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:12:12.482411Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:12.489415Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:12.515037Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:12.519755Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:12:12.521055Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:12.521069Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.523944Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:12:12.527082Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:12.529337Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:12.531225Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:12.531245Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.534957Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:12.536175Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:12.536222Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.538473Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:12:12.538495Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.540698Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:12.540720Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.545163Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:12:12.565817Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:12.565926Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:12.566607Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:12.566620Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.567058Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:12.568833Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:12.578373Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:12.578407Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:12.611434Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:12.682083Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:12.683813Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:12.683830Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.685487Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:12.717508Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:12.719304Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:12.719335Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:12.722351Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:12.722369Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.723745Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:12:12.724457Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:12:12.724469Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.726432Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:12:12.727256Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:12.727631Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:12.741239Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:12:12.741756Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:12:12.741764Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.742956Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:12:12.762898Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:12.763256Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:12.763266Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.764362Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:12.767760Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:12.779850Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:12:12.787800Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:12:12.792029Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:12:12.804393Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:12:12.804415Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.819573Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:12:12.860369Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:12.860409Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.914494Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:12.931927Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:12.949884Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:12.950964Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:12.950989Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.953176Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:12.954504Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:12.954538Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:12.973925Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:12:13.016117Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:13.028815Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:13.029840Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:13.029855Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.032024Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:13.032971Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:13.032987Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.042538Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:13.050694Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:13.051306Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:13.059737Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:13.059754Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.069069Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:13.073657Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:13.100674Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:13.100701Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.166013Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:13.166048Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.172698Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:13.203310Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:13.240538Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:13.240562Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.260152Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:13.287019Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:13.335954Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=29 success=true
2026-09-12T18:12:13.339060Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:12:13.339467Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:13.345768Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:12:13.357570Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:13.357591Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.380591Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:13.503632Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:13.557564Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:13.564181Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:13.564232Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.587680Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:13.587730Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:13.603268Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:13.606021Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:13.606053Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.620930Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:13.639080Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:13.643053Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:13.649256Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:13.649280Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.656065Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:13.673724Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:13.673746Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.684563Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:13.701276Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:13.767971Z  INFO local_candidate{attempt=33}: exchange table and repeat patch storage exchange_table_bytes=27916 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:12:13.851563Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:12:13.891639Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:13.891670Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:13.927157Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:12:14.377268Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:14.442034Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:14.442070Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:14.468934Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:14.978641Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:14.978680Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:15.010262Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:15.010304Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:15.039568Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:15.056244Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:15.248920Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=5191 success=true
2026-09-12T18:12:15.323803Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:15.341837Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:15.345052Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:15.345074Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.346398Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:12:15.348092Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:12:15.348108Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=496 selected_horizon=496 endpoint_lower_bound=288 lower_bound_gap=208 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.348666Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:15.350776Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=1431 row_words=13 horizon=496
2026-09-12T18:12:15.365011Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:12:15.365856Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:15.365867Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.367551Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:15.369709Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:15.386067Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:15.386878Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:15.386896Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.388828Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:15.403472Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:15.413971Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:15.415516Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:15.415545Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.419006Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1452 row_words=15 horizon=3578
2026-09-12T18:12:15.428235Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:12:15.431141Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:15.440143Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:12:15.446377Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:15.446852Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:15.446876Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.448715Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:15.461706Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:15.462159Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:15.462170Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.463362Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:15.469854Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:15.475718Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:15.477243Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:15.477977Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:15.483163Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:15.483191Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.491002Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:15.536300Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:15.536341Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.552367Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:15.552406Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:15.564169Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:15.573457Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:15.578495Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:15.579622Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:15.584643Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:15.584673Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.594539Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:15.612407Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:15.612989Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:15.613005Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.614509Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:15.617012Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:15.618129Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:15.618146Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.620761Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:15.650890Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:15.652164Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:12:15.652184Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.654123Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:12:15.666222Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:15.666649Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:12:15.666659Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.668078Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:12:15.737459Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:15.740899Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:12:15.752604Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:12:15.752628Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.769940Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=25615 success=true
2026-09-12T18:12:15.770441Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:12:15.786196Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:15.798169Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:15.811190Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:15.811233Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.836488Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:15.890362Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:15.890402Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.964742Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:15.972280Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:15.981768Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:15.981796Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:15.990473Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:16.144300Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:16.168811Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:16.168835Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.193308Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:16.193350Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:16.197552Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:16.234478Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:16.253797Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:16.258856Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:16.259457Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:16.259469Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.259892Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:16.261691Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:16.263071Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:16.263102Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.267615Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:16.272938Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:16.273413Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:16.273425Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.274534Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:16.283407Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:16.283441Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.297951Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:16.337219Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=28 success=true
2026-09-12T18:12:16.340403Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:12:16.347445Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:12:16.350128Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:12:16.352131Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:16.368885Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:12:16.368916Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.385238Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:12:16.402093Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:12:16.409661Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:16.409690Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:16.435439Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:12:16.435820Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:16.435847Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.436217Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:16.437247Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:16.437267Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.440293Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:16.440999Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:12:16.455612Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:12:16.455735Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.465035Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:12:16.465038Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=784 success=true
2026-09-12T18:12:16.465113Z  INFO local_candidate{attempt=33}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10136 exchange_table_bytes=27916 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:12:16.465131Z  INFO local_candidate{attempt=33}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27916 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10136 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:12:16.478079Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:12:16.484551Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:16.485125Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:16.485135Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.486885Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:16.495550Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:16.496640Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:16.497010Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:16.497019Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.497897Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:12:16.500597Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:12:16.522703Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:16.543000Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:16.543878Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-12T18:12:16.543896Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.545832Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:16.565295Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:16.565331Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:16.574638Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:16.604464Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:16.604504Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.645000Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:16.654931Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:16.680387Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:16.688312Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:16.691108Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:16.692238Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:16.791721Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:16.798069Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:16.811550Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:16.811573Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.824335Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:16.824375Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.840541Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:16.843121Z  INFO local_candidate{attempt=39}: exchange table and repeat patch storage exchange_table_bytes=27996 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:12:16.843984Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:12:16.846947Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:16.849591Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:16.849620Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.858627Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:16.866051Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:16.866538Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:16.866547Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.867792Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:16.942740Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:16.966151Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:16.966178Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:16.995668Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:17.041477Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:17.081319Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:17.108693Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:17.108717Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.115020Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:17.115043Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.139680Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:17.186371Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=721 success=true
2026-09-12T18:12:17.196147Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:17.198492Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:17.209603Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:17.215189Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:17.215814Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:17.215832Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.218013Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:17.229564Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:17.229920Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:17.229928Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.230843Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:17.232901Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:17.233855Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:17.233871Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.235290Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:17.236383Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:17.239374Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:17.240443Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:17.240953Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:17.245089Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:17.249572Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:17.255363Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:17.259362Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:17.260933Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:17.261634Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:17.299582Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:17.306366Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:17.306424Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.316584Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:17.328987Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:17.329392Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:17.329403Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.330528Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:17.359909Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:17.360705Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:12:17.360718Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.362480Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:12:17.371257Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:17.371560Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:12:17.371566Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.372595Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:12:17.485963Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:17.536179Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:17.536227Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.604968Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:17.677982Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:17.680658Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:17.680678Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.684619Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:17.697064Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:17.735178Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:17.735224Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.770323Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:17.773309Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:17.792438Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:17.792461Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.809444Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:12:17.810568Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:12:17.810582Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.812969Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:12:17.816523Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:17.828541Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:12:17.829241Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:12:17.829251Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.830741Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:12:17.882561Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:12:17.895499Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:12:17.914845Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:12:17.928062Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:12:17.928084Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.937753Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:12:17.959748Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:17.961907Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:12:17.962892Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:17.962905Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.964638Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:12:17.964676Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:17.964691Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:17.969517Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:17.975807Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:18.029655Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:18.029696Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.051588Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:18.051626Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:18.082600Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:18.097684Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:18.135826Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:18.149175Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:12:18.149225Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.160799Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:12:18.167834Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:18.169087Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:18.169114Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.171351Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:12:18.178189Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:18.183362Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:12:18.187945Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:18.188687Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:18.188699Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.190893Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:18.204508Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:12:18.212192Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:12:18.212226Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.223394Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:12:18.264954Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:18.270375Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:18.270397Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.294437Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:18.333171Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:18.335786Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:18.335816Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.341270Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:18.583372Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:18.584277Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:18.605883Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:18.605906Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.605963Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:18.605989Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.622787Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:12:18.635599Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:18.644293Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:18.644762Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:18.644777Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.646414Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:18.662291Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:18.662952Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:18.662965Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.664752Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:18.698433Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:18.823132Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:18.823174Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:18.887488Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:18.951946Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:18.954074Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:18.954105Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:18.957221Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:18.982487Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:18.982513Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:18.985733Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:19.011352Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:19.019256Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:19.019281Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.020035Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:19.055329Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:19.055353Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.083183Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5680 paired_horizon=11275 use_paired=false
2026-09-12T18:12:19.097462Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=11813 success=true
2026-09-12T18:12:19.106976Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:19.114315Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:19.129610Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:19.138099Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:19.138965Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:19.138978Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.142023Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:19.151836Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:19.151865Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5680 selected_horizon=5680 endpoint_lower_bound=4656 lower_bound_gap=1024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:19.181114Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=344 horizon=5680
2026-09-12T18:12:19.185952Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:19.185976Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12868 selected_horizon=12868 endpoint_lower_bound=11940 lower_bound_gap=928 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.194852Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:19.197195Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:19.197221Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.199772Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:19.237411Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:19.247479Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-12T18:12:19.278859Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:19.282328Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:19.282885Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:19.282894Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.284593Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:19.338139Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:19.338634Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:19.338646Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.339077Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:19.339098Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.340233Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:19.381923Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:19.416442Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:19.437122Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:19.452607Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:19.452637Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.510219Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:19.510255Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:19.542350Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:19.546661Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:12:19.567634Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:19.567685Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.575463Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=35522 success=true
2026-09-12T18:12:19.589365Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:19.598678Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:19.703463Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:19.796023Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:19.796058Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.863276Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:19.919968Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:19.919996Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.929877Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:19.952505Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:19.954174Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:19.955293Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:19.958127Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:19.958149Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.985197Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:19.985245Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:19.986840Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:19.996268Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:20.010346Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:20.011404Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:20.016771Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:20.016791Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.040576Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:20.049091Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:20.049116Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.053786Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:20.067154Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:20.067180Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.080792Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:20.097958Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:20.149375Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:20.149409Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:20.152693Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:20.157591Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:20.157611Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.158478Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:12:20.162165Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=452 row_words=53 horizon=8353
2026-09-12T18:12:20.162981Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:20.175011Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:12:20.175036Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.187987Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:12:20.226554Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:20.228908Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:20.228924Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.231493Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:20.234018Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:12:20.235395Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:20.235413Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.237920Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:12:20.283692Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:20.283726Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:20.297846Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:20.324953Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:20.325924Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:20.325939Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.328133Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:20.340475Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:20.340927Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:20.340934Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.342139Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:20.363963Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:12:20.365040Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:12:20.365052Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.367632Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:12:20.374001Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:20.374032Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:20.381086Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:20.383650Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:12:20.384371Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:12:20.384381Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.386028Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:12:20.403325Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:20.437233Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:20.437268Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.440618Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:12:20.450542Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:12:20.472820Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:20.499418Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:12:20.510420Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:12:20.510442Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.524328Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:12:20.593628Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:20.615853Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:20.615880Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.635488Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:20.638167Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:20.638225Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:20.650445Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:20.656794Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:20.668512Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:20.671418Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:20.672576Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:20.672591Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.675843Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:20.680199Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:20.680236Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.702428Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:12:20.712501Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:20.712528Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.746689Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:20.757597Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:20.757627Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.760110Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:20.774545Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:20.785499Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:20.788674Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:20.788705Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.793321Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:20.814868Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:20.814896Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:20.822469Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:20.835479Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:20.847798Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:20.848452Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:20.848467Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.851197Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:20.866538Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:20.866898Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:20.866907Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.867956Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:20.872602Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:20.876622Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:20.877739Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:20.878297Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:20.887111Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:20.951779Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:20.955353Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:20.955370Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.961497Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:20.972145Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:20.972514Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:20.972524Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.973448Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:20.973535Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:20.996550Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:20.997198Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:12:20.997225Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:20.998532Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:12:21.003504Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:21.003524Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.006867Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:21.007127Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:12:21.007132Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.008028Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:12:21.024829Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:21.024860Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:21.037226Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:21.039610Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:21.051401Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:21.051850Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:21.051859Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.052952Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:12:21.055692Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:21.060410Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:12:21.065181Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:21.067021Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:21.067559Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:21.067571Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.069640Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:21.085093Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:21.085761Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:21.085781Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.087674Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:21.096406Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:21.097079Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:21.097088Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.098797Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:21.154633Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:21.219669Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:21.219698Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.327887Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:21.359848Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:21.365149Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:21.367136Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:21.367948Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:21.445971Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:21.454127Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:21.472389Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:21.472413Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.510968Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:21.515341Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:21.515376Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:21.541461Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:21.553170Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:21.553168Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:21.553640Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:21.553655Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.554151Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:21.554161Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.554888Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:21.556336Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:21.565036Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:21.565905Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:12:21.587990Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:21.591991Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:21.598976Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:21.598997Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.614612Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:21.614633Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.637729Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:12:21.639445Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:21.650878Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:12:21.650906Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.652035Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:21.657108Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:12:21.687834Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:21.687875Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:21.715194Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:21.722648Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:21.722672Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:21.729643Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:21.746935Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:22.058545Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:22.058583Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:22.059155Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:22.080935Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:22.087676Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:22.090289Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:22.118866Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:22.118905Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:22.120800Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:22.120823Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:22.158911Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:22.164717Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:22.164744Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:22.207001Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:22.257005Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:22.359780Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:22.359819Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:22.441510Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:22.494502Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:22.557221Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:22.557246Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:22.607853Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:22.665101Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:22.699061Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:22.699084Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:22.708427Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:22.741418Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:22.771794Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:22.771818Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:22.804400Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:22.872878Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:22.931076Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:22.931118Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:22.991952Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:23.001143Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:23.058940Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:23.058974Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:23.144230Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:23.531745Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:23.555419Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:23.586076Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:23.586105Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:23.595350Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:12:23.618637Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:23.634817Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:23.634844Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:23.667260Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:12:23.671772Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:23.671800Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:23.715131Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:23.941854Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12674 success=true
2026-09-12T18:12:23.963871Z  INFO local_candidate{attempt=38}: costed final placed program final_cycles=11834782 final_exchange=4925270
2026-09-12T18:12:24.260509Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:24.279014Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:24.279049Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:24.339160Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:24.339187Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:24.351186Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:24.485061Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:24.485099Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:24.491159Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:24.494943Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:25.218486Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=109 success=true
2026-09-12T18:12:25.309083Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=90 success=true
2026-09-12T18:12:25.493922Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:25.610606Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:25.610642Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:25.650156Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:25.666550Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=29642 success=true
2026-09-12T18:12:25.698350Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=32 success=true
2026-09-12T18:12:25.701606Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:12:25.707162Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:12:25.771258Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=409 success=true
2026-09-12T18:12:26.072960Z  INFO local_candidate{attempt=42}: exchange table and repeat patch storage exchange_table_bytes=27916 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:12:26.492621Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:26.598040Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:26.598068Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:26.638496Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:26.654032Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=7556 success=true
2026-09-12T18:12:26.862685Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:26.869486Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:26.869502Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:26.881973Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:26.886562Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=8032 success=true
2026-09-12T18:12:26.886583Z  INFO local_candidate{attempt=39}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10156 exchange_table_bytes=27996 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:12:26.886595Z  INFO local_candidate{attempt=39}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27996 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10156 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:12:27.369694Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=483 success=true
2026-09-12T18:12:27.378691Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:27.379037Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:27.380040Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:27.380620Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:27.385134Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:27.385595Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:27.385607Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.387030Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:27.387507Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:27.390829Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:27.396417Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:27.396758Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:27.396773Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.397683Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:27.397992Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:27.398373Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:12:27.398385Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.398692Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:27.399168Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:27.399181Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.399686Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:12:27.401132Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:12:27.402720Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:27.402801Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:27.403516Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:27.403539Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.403655Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:27.403667Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.406391Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:27.406981Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:27.409142Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:27.409588Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:27.410366Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:27.410579Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:27.410626Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.414240Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:27.417471Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:12:27.417846Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:27.418997Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:12:27.419024Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.421640Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:12:27.430219Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:27.430671Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:27.430681Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.431558Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:12:27.431824Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:27.434346Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:27.434967Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:27.435388Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:27.437136Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:27.437632Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:27.438141Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:12:27.438594Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:27.438608Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.439585Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:12:27.439605Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.440279Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:27.440673Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:27.443189Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:12:27.446655Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:27.451693Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:27.451721Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.456234Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:12:27.457593Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:12:27.461691Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:27.490496Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:27.490891Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:27.490898Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.491904Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:27.492378Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:27.492755Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:27.492763Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.493884Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:27.519950Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:27.544124Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:27.547045Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:27.547067Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.547605Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:27.548594Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:27.548609Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.550820Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:12:27.551536Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:12:27.554969Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:27.555635Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:27.555649Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.557450Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:27.561412Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:27.565751Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:27.565768Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.571314Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:27.603238Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:27.632717Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:27.632745Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:27.643765Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:27.661269Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:27.661350Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.665222Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:27.665257Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.676940Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:27.682306Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:27.682324Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.686040Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:12:27.702137Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:27.714521Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:27.729894Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:27.729912Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.751750Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:27.816041Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:27.904899Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=73 success=true
2026-09-12T18:12:27.905035Z  INFO local_candidate{attempt=42}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10136 exchange_table_bytes=27916 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:12:27.905050Z  INFO local_candidate{attempt=42}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27916 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10136 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:12:27.926840Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:27.947914Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:27.949977Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:27.949997Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.957918Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:27.957934Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:27.972255Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:27.972879Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:27.995948Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:27.995980Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:28.020378Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:28.120783Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:12:28.134014Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:12:28.134034Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.142450Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:12:28.165128Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:12:28.166189Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:28.166220Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.168096Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:12:28.360440Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=455 success=true
2026-09-12T18:12:28.369396Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:28.374519Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:28.390661Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:28.390972Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:12:28.391137Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:28.391144Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.392483Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:12:28.392506Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.392487Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:28.393964Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:28.394645Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:28.394662Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.396002Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:12:28.397398Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:28.403953Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:28.406118Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:28.406134Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.408987Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:28.409151Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:28.413660Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:28.414281Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:28.414296Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.415999Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:28.417610Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:12:28.417684Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:12:28.418627Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:12:28.418644Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.420563Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:12:28.424285Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:28.425552Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:12:28.431543Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:28.433633Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:28.434582Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:28.451881Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:28.557855Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:28.564135Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:28.564159Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.575417Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:28.582972Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:28.583004Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:28.589671Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:12:28.594436Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:28.595639Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:28.596347Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:28.596363Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.598109Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:12:28.598124Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.598257Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:28.609526Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:12:28.639763Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:28.640637Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:12:28.640649Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.642404Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:12:28.651861Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:28.652229Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:12:28.652243Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.653399Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:12:28.861566Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:28.880536Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:28.880558Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.890395Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:28.913127Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:28.924544Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:12:28.934324Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:28.939071Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:28.939801Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:28.939813Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.941614Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:28.941630Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:28.941655Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.950896Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:28.950913Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.957265Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:28.957293Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.976249Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:28.977379Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:28.985686Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:12:28.987059Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:28.987350Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:28.987840Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:28.987849Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:28.989184Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:28.997031Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:28.997061Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:29.003601Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:29.006155Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:29.006991Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:29.007011Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.008406Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:29.008477Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:29.008924Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:29.008933Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.009365Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:29.009985Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:12:29.010188Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:29.010972Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:29.012646Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:29.012668Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.014667Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:29.018686Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:12:29.019134Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:29.022726Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:29.023182Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:29.023190Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.025080Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:29.035385Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:29.035730Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:29.035738Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.037153Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:29.045565Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:29.045896Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:29.045903Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.046798Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:29.050042Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:29.151623Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:29.152078Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:29.152088Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.153352Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:29.158312Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:29.171226Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:29.171257Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:29.177885Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:29.177903Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.177968Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:29.188120Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:29.190226Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:29.190248Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.192250Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:29.205999Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:29.214611Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:29.219466Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:29.219484Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.224745Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:29.263411Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:29.269370Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:29.269395Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.276347Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:29.454658Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:29.466341Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:29.466371Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.476299Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:29.486733Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:29.488105Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:12:29.488124Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.494766Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:12:29.515562Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:29.777071Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:29.783370Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:29.800871Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:29.800891Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.813982Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:29.855864Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:29.855894Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.885132Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:29.926212Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:29.926241Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:29.959020Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:29.967429Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:29.979387Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10403 success=true
2026-09-12T18:12:30.005704Z  INFO local_candidate{attempt=37}: costed final placed program final_cycles=11839114 final_exchange=4930067
2026-09-12T18:12:30.048470Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:30.078491Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:30.084562Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:30.084588Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:30.087590Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:30.088394Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:30.088413Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:30.092333Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:30.122672Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:30.122707Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:30.127434Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:30.127458Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:30.153907Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:30.156601Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:30.159723Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:30.377184Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:30.377238Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:30.405316Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:30.658316Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:30.714532Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:30.714557Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:30.749949Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:30.775549Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:30.775575Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:30.776374Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:30.806898Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:30.865020Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:30.940306Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:30.940343Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:31.039325Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:31.297909Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=138 success=true
2026-09-12T18:12:31.374817Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=76 success=true
2026-09-12T18:12:31.470337Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:31.569731Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:31.569769Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:31.725070Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:31.828070Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=396 success=true
2026-09-12T18:12:31.835488Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:31.910673Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:31.910709Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:32.015236Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:32.129633Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:32.129671Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:32.194176Z  INFO local_candidate{attempt=37}: retained faster incumbent candidate_cycles=11839114 cycles=11838110
2026-09-12T18:12:32.202959Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:32.363596Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:32.457381Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:32.457416Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:32.632799Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:32.885831Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:32.942018Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:32.942045Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:32.986106Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:33.138114Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:12:33.167237Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:33.167260Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:33.204504Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:12:33.346414Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:33.371510Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:33.371544Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:33.391781Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:12:33.705562Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:33.729183Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:33.729243Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:33.747613Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:34.048194Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:34.121722Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:34.121771Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:34.157722Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:34.317316Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:34.348781Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:34.348814Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:34.391409Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:34.920302Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:34.960342Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:34.960370Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:34.991365Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:35.005682Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:12:35.020967Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:12:35.020986Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:35.031856Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:12:35.066458Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:12:35.067671Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:35.067688Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:35.069880Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:12:35.978335Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:35.983562Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:36.099919Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:36.099950Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:36.114542Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:36.114571Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:36.144649Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:36.165482Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:36.166184Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=7805 success=true
2026-09-12T18:12:37.093783Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11427 success=true
2026-09-12T18:12:37.131000Z  INFO local_candidate{attempt=29}: costed final placed program final_cycles=11836299 final_exchange=4928435
2026-09-12T18:12:37.206836Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:37.206875Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:37.279478Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:37.528248Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:12:37.537620Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:12:37.537641Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:37.550615Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:12:37.859919Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:37.898449Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:37.898473Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:37.926948Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:38.065809Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:12:38.088854Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:38.088878Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:38.118239Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:12:38.198809Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:38.324850Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:38.340869Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=91 success=true
2026-09-12T18:12:38.377467Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:38.377489Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:38.414175Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:38.434227Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=93 success=true
2026-09-12T18:12:38.923668Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=426 success=true
2026-09-12T18:12:39.506637Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:39.577605Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:39.577634Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:39.626536Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:39.700742Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:39.763129Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:39.763162Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:39.823188Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:40.324333Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:40.336001Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:12:40.336018Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:40.341629Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:12:40.383762Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:40.386506Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:40.386522Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:40.389084Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:40.433826Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:40.521460Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:40.521488Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:40.625284Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:12:41.619360Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:41.619398Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:41.648016Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:41.978796Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=15324 success=true
2026-09-12T18:12:42.007390Z  INFO local_candidate{attempt=30}: costed final placed program final_cycles=11838110 final_exchange=4929248
2026-09-12T18:12:42.897439Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:42.920968Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:42.920989Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:42.935932Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:12:42.943973Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=30566 success=true
2026-09-12T18:12:42.944057Z  INFO local_candidate{attempt=40}: placing generated tile programs linked_end=383612 host_code_base=383616 host_code_bytes=8892 generated_code_bytes=10096 exchange_table_bytes=27948 executable_ranges=[(378884, 378888), (380620, 380624), (382636, 382640), (383612, 383616), (392576, 524288)]
2026-09-12T18:12:42.944105Z  INFO local_candidate{attempt=40}: allocated package support memory linked_end=383612 profile_bytes=0 exchange_table_bytes=27948 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10096 code_address=392576 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:12:42.945968Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=25759 success=true
2026-09-12T18:12:42.947295Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=15577 success=true
2026-09-12T18:12:42.947719Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=27698 success=true
2026-09-12T18:12:43.252422Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=128 success=true
2026-09-12T18:12:43.353090Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=100 success=true
2026-09-12T18:12:43.514737Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=570 success=true
2026-09-12T18:12:43.524311Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:43.530106Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:43.531216Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:43.532853Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:43.533717Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:43.541094Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:43.542068Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:43.542088Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.545529Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:43.548424Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:43.548957Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:43.548967Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.551122Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:43.551437Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:43.552130Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1744 maximum_identical_destinations=1
2026-09-12T18:12:43.552139Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=4200 selected_horizon=4200 endpoint_lower_bound=2916 lower_bound_gap=1284 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.553914Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=0 row_words=41 horizon=4200
2026-09-12T18:12:43.554193Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:12:43.555995Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:12:43.556014Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.559664Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:12:43.562997Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:43.563465Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:43.563475Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.564236Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:43.564648Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:43.564851Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:43.565372Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:43.565385Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.566923Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:43.570773Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:43.571183Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:43.573402Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:43.573420Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.575124Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:43.576270Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:43.577243Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:43.581680Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:43.584020Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:43.584974Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:43.586814Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:12:43.587940Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:12:43.587955Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.590384Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:12:43.595439Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:43.601743Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:43.601758Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.610629Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:43.618490Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:43.625313Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:43.625823Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:43.625838Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.627116Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:43.664328Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:12:43.674426Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:43.675991Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:12:43.676012Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.678792Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:12:43.678959Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:12:43.694448Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:43.695028Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:12:43.695042Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.697173Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:12:43.761413Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:43.768522Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:43.768541Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.776429Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=64 row_words=133 horizon=7129
2026-09-12T18:12:43.784698Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:12:43.794532Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:12:43.794555Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.811654Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:12:43.861033Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=440 success=true
2026-09-12T18:12:43.886148Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:43.888661Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:43.888678Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.892140Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:43.950967Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:43.952141Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:43.952163Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:43.954218Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:12:43.962992Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:43.970290Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:12:44.031681Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:44.032897Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:44.032917Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.035558Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:44.177527Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:44.212023Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:44.212057Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.242738Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:44.276764Z  INFO local_candidate{attempt=30}: retained faster incumbent candidate_cycles=11838110 cycles=11838110
2026-09-12T18:12:44.281996Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:44.314063Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:44.314110Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.337870Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:44.354250Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:44.362166Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:44.362187Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.376625Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:44.398221Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:44.398814Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:44.398822Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.400181Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:44.439303Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:44.445113Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:44.445133Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.452181Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:44.475136Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:44.475182Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:44.498426Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:12:44.507528Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:44.509611Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:44.515086Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:12:44.515103Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.521419Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:12:44.521437Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.527369Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:12:44.528858Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:12:44.552404Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:44.553143Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:44.553155Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.556164Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:44.565574Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:12:44.566878Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:44.566892Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.569636Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:12:44.633504Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:44.658302Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:44.658329Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.687825Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:44.687861Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:44.695783Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:44.703463Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:44.723711Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:44.732869Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:44.734307Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:44.734326Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.737167Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:44.751670Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:44.751689Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.793041Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:44.794070Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:44.794099Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:44.799695Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:12:44.810449Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:44.834236Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:44.834259Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.845516Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:44.845876Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:44.845882Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.846838Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:44.885417Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:12:44.922474Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:44.936237Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:44.936276Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:44.959916Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:45.456038Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:45.479910Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:45.479939Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:45.496106Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:45.499482Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:12:45.528126Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:45.528162Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:45.566184Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:45.839336Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:45.839377Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:45.885300Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:45.916058Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:46.014169Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:46.014198Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:46.059344Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:46.102273Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:46.102301Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:46.114399Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:46.147951Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:46.215087Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:46.254824Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:46.254850Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:46.297324Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:46.352096Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:46.428255Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:46.428289Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:46.521226Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:46.601931Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:46.676107Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:46.676131Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:46.747315Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:47.513435Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:47.630233Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:47.630269Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:47.796527Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:48.270057Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:48.270095Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:48.344449Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:48.384129Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:48.413993Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:48.438484Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:48.438519Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:48.484179Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:48.484222Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:48.516628Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:48.544187Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:48.550172Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:48.594676Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:48.594704Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:48.637001Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:48.643639Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12477 success=true
2026-09-12T18:12:48.656152Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=83506 success=true
2026-09-12T18:12:48.657479Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=58876 success=true
2026-09-12T18:12:48.659649Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=54035 success=true
2026-09-12T18:12:48.672354Z  INFO local_candidate{attempt=42}: costed final placed program final_cycles=11838110 final_exchange=4929248
2026-09-12T18:12:49.075161Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:49.223274Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:49.223310Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:49.395147Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:49.416334Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=39040 success=true
2026-09-12T18:12:49.437314Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=50056 success=true
2026-09-12T18:12:49.450772Z  INFO local_candidate{attempt=36}: costed final placed program final_cycles=11832742 final_exchange=4931324
2026-09-12T18:12:50.078108Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=228 success=true
2026-09-12T18:12:50.167905Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=89 success=true
2026-09-12T18:12:50.703321Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=463 success=true
2026-09-12T18:12:50.988397Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=363 success=true
2026-09-12T18:12:51.110666Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:51.137175Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=148 success=true
2026-09-12T18:12:51.153392Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69185 maximum_identical_destinations=1
2026-09-12T18:12:51.153417Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5100 selected_horizon=5100 endpoint_lower_bound=2736 lower_bound_gap=2364 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:51.198143Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=21 row_words=540 horizon=5100
2026-09-12T18:12:51.256556Z  INFO local_candidate{attempt=42}: retained faster incumbent candidate_cycles=11838110 cycles=11838110
2026-09-12T18:12:51.447108Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=35677 success=true
2026-09-12T18:12:51.489337Z  INFO local_candidate{attempt=32}: costed final placed program final_cycles=11838110 final_exchange=4929248
2026-09-12T18:12:51.508330Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:51.591248Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:51.591280Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:51.696460Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:51.722076Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=41349 success=true
2026-09-12T18:12:51.732300Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=521 success=true
2026-09-12T18:12:51.928869Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=41117 success=true
2026-09-12T18:12:51.951128Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:12:51.956969Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:12:51.965812Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:12:51.971666Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:12:51.972136Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:51.972147Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:51.974064Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:12:51.974860Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:12:51.974913Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:12:51.975030Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:12:51.975540Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:12:51.975552Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:51.976372Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:12:51.976391Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:51.977800Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:12:51.978010Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:12:51.979085Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:12:51.981340Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:12:51.991645Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:12:51.992239Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:51.992262Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:51.994108Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:12:52.002936Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:12:52.008371Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:12:52.009071Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:12:52.009786Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:12:52.010295Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:12:52.010396Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:12:52.011438Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:12:52.011450Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:52.014430Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:12:52.025604Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:12:52.100524Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:12:52.108233Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:12:52.121809Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:12:52.121835Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:52.127388Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:12:52.134028Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:12:52.158528Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:12:52.159312Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:12:52.159328Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:52.161419Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:12:52.206542Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:12:52.208119Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:12:52.208138Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:52.210404Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:12:52.224652Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:12:52.225165Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:12:52.225175Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:52.226652Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:12:52.226908Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:12:52.393086Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:12:52.393129Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:52.464776Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:12:52.502117Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=40952 success=true
2026-09-12T18:12:52.618242Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:12:52.649016Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:12:52.649057Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:52.688962Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:12:52.854954Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:12:52.860711Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:12:52.860734Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:52.867605Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:12:53.015084Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:12:53.015124Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:53.042138Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:12:53.051100Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:12:53.085971Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:53.085999Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:53.140661Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:12:53.258562Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:12:53.258600Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:53.268307Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:12:53.459323Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:12:53.478397Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:12:53.478432Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:53.489893Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:12:53.571859Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:12:53.577336Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:12:53.577359Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:53.593561Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:12:53.652315Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:12:53.656574Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:53.656596Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:53.660568Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:12:53.673268Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:12:53.682688Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:12:53.908814Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:12:53.957898Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:12:53.957932Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:53.963585Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:12:53.972344Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:12:53.972364Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:53.975540Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:12:53.981836Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:12:53.994012Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:12:53.994032Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.002156Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:12:54.002880Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:12:54.002891Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.005292Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:12:54.009213Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:12:54.011048Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:12:54.019510Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:12:54.020184Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:12:54.020199Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.021953Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:12:54.056428Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:12:54.114579Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:12:54.114615Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.154656Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:12:54.220503Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:12:54.249440Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:12:54.249488Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.277625Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:12:54.346618Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:12:54.348942Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:12:54.348957Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.352229Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:12:54.359511Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:12:54.370223Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:12:54.370240Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.378510Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:12:54.378539Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:54.388275Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:12:54.392050Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:12:54.523889Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:12:54.646186Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=44270 success=true
2026-09-12T18:12:54.681405Z  INFO local_candidate{attempt=27}: costed final placed program final_cycles=11835959 final_exchange=4928015
2026-09-12T18:12:54.736383Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:12:54.762416Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:12:54.762446Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.795414Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:12:54.805841Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:12:54.805875Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:54.826764Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:12:54.827691Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:12:54.827704Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.830495Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:12:54.844257Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:12:54.853457Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:12:54.854415Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:12:54.854427Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.856985Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:12:54.922144Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:12:54.922772Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:54.922784Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.924573Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:12:54.939970Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:12:54.940504Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:12:54.940515Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.942560Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:12:54.987233Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:12:54.988964Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:12:54.989919Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:12:54.989934Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:54.992665Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:12:55.015888Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:12:55.015908Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:55.018914Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12071 success=true
2026-09-12T18:12:55.044536Z  INFO local_candidate{attempt=28}: costed final placed program final_cycles=11843053 final_exchange=4934272
2026-09-12T18:12:55.049864Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:12:55.262143Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:12:55.277435Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:12:55.307148Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:12:55.307174Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:55.330932Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:12:55.330958Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:55.338029Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:12:55.346272Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:12:55.359909Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:12:55.379865Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:12:55.379902Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:55.404151Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:12:55.404183Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:55.415876Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:12:55.442470Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:12:55.455655Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:12:55.547386Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:12:55.571961Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:12:55.571990Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:55.587803Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:12:55.891721Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12944 success=true
2026-09-12T18:12:55.924298Z  INFO local_candidate{attempt=39}: costed final placed program final_cycles=11834771 final_exchange=4925270
2026-09-12T18:12:56.025497Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:12:56.038814Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=13092 success=true
2026-09-12T18:12:56.070592Z  INFO local_candidate{attempt=33}: costed final placed program final_cycles=11838110 final_exchange=4929248
2026-09-12T18:12:56.112016Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:12:56.112050Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:56.207653Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:12:56.225565Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=280 success=true
2026-09-12T18:12:56.331155Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=105 success=true
2026-09-12T18:12:56.564511Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=251 success=true
2026-09-12T18:12:56.604905Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:12:56.653349Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=88 success=true
2026-09-12T18:12:56.692821Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:12:56.692856Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:56.791631Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:12:56.823261Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:12:56.834019Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:12:56.896330Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:12:56.896363Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:56.903757Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:12:56.903783Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:56.929467Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:12:56.961298Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:12:56.995354Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=439 success=true
2026-09-12T18:12:57.129041Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=414 success=true
2026-09-12T18:12:57.464187Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=410 success=true
2026-09-12T18:12:57.464269Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=153 success=true
2026-09-12T18:12:57.556768Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=92 success=true
2026-09-12T18:12:57.558045Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=93 success=true
2026-09-12T18:12:57.801221Z  INFO local_candidate{attempt=28}: retained faster incumbent candidate_cycles=11843053 cycles=11838110
2026-09-12T18:12:57.987702Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:12:58.003386Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:12:58.003409Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:58.015115Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:12:58.046185Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:12:58.049084Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:12:58.049105Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:58.053137Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:12:58.085371Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=394 success=true
2026-09-12T18:12:58.098497Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=394 success=true
2026-09-12T18:12:58.160319Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:12:58.291733Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:12:58.291762Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:12:58.292972Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:12:58.293006Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:12:58.382396Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:12:58.410886Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=5395 success=true
2026-09-12T18:12:58.455343Z  INFO local_candidate{attempt=33}: retained faster incumbent candidate_cycles=11838110 cycles=11838110
2026-09-12T18:12:58.468514Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:12:58.502866Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=91 success=true
2026-09-12T18:12:58.726721Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=48666 success=true
2026-09-12T18:12:58.761124Z  INFO local_candidate{attempt=43}: costed final placed program final_cycles=11837299 final_exchange=4928434
2026-09-12T18:12:58.982070Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=436 success=true
2026-09-12T18:12:59.483111Z  INFO local_candidate{attempt=32}: retained faster incumbent candidate_cycles=11838110 cycles=11838110
2026-09-12T18:13:00.201587Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=155 success=true
2026-09-12T18:13:00.300079Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=98 success=true
2026-09-12T18:13:00.822495Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=429 success=true
2026-09-12T18:13:01.055985Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12398 success=true
2026-09-12T18:13:01.079918Z  INFO local_candidate{attempt=35}: costed final placed program final_cycles=11832742 final_exchange=4931324
2026-09-12T18:13:01.192420Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12536 success=true
2026-09-12T18:13:01.220463Z  INFO local_candidate{attempt=25}: costed final placed program final_cycles=11836299 final_exchange=4928435
2026-09-12T18:13:01.238507Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:13:01.387194Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:01.387246Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:01.443709Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:13:01.470973Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=17956 success=true
2026-09-12T18:13:01.471073Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=9542 success=true
2026-09-12T18:13:01.711541Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12274 success=true
2026-09-12T18:13:01.738492Z  INFO local_candidate{attempt=31}: costed final placed program final_cycles=11838110 final_exchange=4929248
2026-09-12T18:13:02.315936Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=127 success=true
2026-09-12T18:13:02.404132Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=88 success=true
2026-09-12T18:13:02.549230Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=122 success=true
2026-09-12T18:13:02.642520Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=93 success=true
2026-09-12T18:13:02.920896Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=14261 success=true
2026-09-12T18:13:02.972507Z  INFO local_candidate{attempt=41}: costed final placed program final_cycles=11838110 final_exchange=4929248
2026-09-12T18:13:02.988637Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=429 success=true
2026-09-12T18:13:02.998597Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=119 success=true
2026-09-12T18:13:03.096125Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=97 success=true
2026-09-12T18:13:03.172214Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=448 success=true
2026-09-12T18:13:03.592465Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=424 success=true
2026-09-12T18:13:03.863674Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12141 success=true
2026-09-12T18:13:03.892256Z  INFO local_candidate{attempt=26}: costed final placed program final_cycles=11836549 final_exchange=4928434
2026-09-12T18:13:03.927470Z  INFO local_candidate{attempt=31}: retained faster incumbent candidate_cycles=11838110 cycles=11838110
2026-09-12T18:13:04.208712Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11706 success=true
2026-09-12T18:13:04.247766Z  INFO local_candidate{attempt=34}: costed final placed program final_cycles=11832742 final_exchange=4931324
2026-09-12T18:13:04.272494Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=117 success=true
2026-09-12T18:13:04.395735Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=123 success=true
2026-09-12T18:13:04.880069Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=422 success=true
2026-09-12T18:13:05.220983Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=112 success=true
2026-09-12T18:13:05.240377Z  INFO local_candidate{attempt=41}: retained faster incumbent candidate_cycles=11838110 cycles=11838110
2026-09-12T18:13:05.314974Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=93 success=true
2026-09-12T18:13:05.532579Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=108 success=true
2026-09-12T18:13:05.627840Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=95 success=true
2026-09-12T18:13:05.801447Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=422 success=true
2026-09-12T18:13:06.142286Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=453 success=true
2026-09-12T18:13:12.094730Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10623 success=true
2026-09-12T18:13:12.135355Z  INFO local_candidate{attempt=24}: costed final placed program final_cycles=11835316 final_exchange=4927462
2026-09-12T18:13:12.175246Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10704 success=true
2026-09-12T18:13:12.204806Z  INFO local_candidate{attempt=40}: costed final placed program final_cycles=11836529 final_exchange=4929125
2026-09-12T18:13:13.311396Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=94 success=true
2026-09-12T18:13:13.424677Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=87 success=true
2026-09-12T18:13:13.430352Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=118 success=true
2026-09-12T18:13:13.511145Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=86 success=true
2026-09-12T18:13:13.890151Z  INFO local_candidate{attempt=24}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=406 success=true
2026-09-12T18:13:13.966824Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=410 success=true
2026-09-12T18:13:17.077280Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=24 before=11838110 after=11835316 changed_operations=[33] opened_boundaries=[378]
2026-09-12T18:13:18.244617Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: saved mid-plan search state path=artifacts/search-state-20260912/bs1/state.json attempts=25 bytes=19589271
2026-09-12T18:13:19.723558Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-0-480354-0021.json scope="local-25-candidate-0" peak_step=62 effective_peak_bytes=472824
2026-09-12T18:13:19.791032Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-1-480354-0022.json scope="local-25-candidate-1" peak_step=62 effective_peak_bytes=472824
2026-09-12T18:13:19.867289Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-2-480354-0023.json scope="local-25-candidate-2" peak_step=62 effective_peak_bytes=472824
2026-09-12T18:13:19.935085Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-3-480354-0024.json scope="local-25-candidate-3" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.008034Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-4-480354-0025.json scope="local-25-candidate-4" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.075265Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-5-480354-0026.json scope="local-25-candidate-5" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:13:20.147917Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-6-480354-0027.json scope="local-25-candidate-6" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.214676Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-7-480354-0028.json scope="local-25-candidate-7" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.280298Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-8-480354-0029.json scope="local-25-candidate-8" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.350479Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-9-480354-0030.json scope="local-25-candidate-9" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.419676Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-10-480354-0031.json scope="local-25-candidate-10" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.485724Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-11-480354-0032.json scope="local-25-candidate-11" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.556394Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-12-480354-0033.json scope="local-25-candidate-12" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.622636Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-13-480354-0034.json scope="local-25-candidate-13" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.688227Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-14-480354-0035.json scope="local-25-candidate-14" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.763244Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-15-480354-0036.json scope="local-25-candidate-15" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:13:20.825555Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-16-480354-0037.json scope="local-25-candidate-16" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:13:20.879136Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-17-480354-0038.json scope="local-25-candidate-17" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:20.955856Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-18-480354-0039.json scope="local-25-candidate-18" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:21.022541Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-19-480354-0040.json scope="local-25-candidate-19" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:21.092043Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-25-candidate-20-480354-0041.json scope="local-25-candidate-20" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:13:21.092774Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=21 threads=24
2026-09-12T18:13:29.759898Z  INFO local_candidate{attempt=36}: screened exchange table geometry expansion_ms=7188 expansion_and_footprint_ms=8657 estimated_row_bytes=37504 heuristic_row_bytes=106684 geometry_fragments_per_tile=4296 fragment_limit=16384
2026-09-12T18:13:29.893465Z  INFO local_candidate{attempt=36}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:30.578029Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:13:30.601661Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:13:30.602475Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:30.602493Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:30.605134Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:13:30.621233Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:13:30.621832Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:30.621842Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:30.623439Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:13:30.629366Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:13:30.632620Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:13:30.640936Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:13:30.643176Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:13:30.644232Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:13:30.659158Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:13:30.755611Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:13:30.762410Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:13:30.762436Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:30.772668Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:13:30.791931Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:13:30.792528Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:13:30.792546Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:30.794341Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:13:30.824330Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:13:30.824989Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:13:30.825000Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:30.826499Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:13:30.835130Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:13:30.835472Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:13:30.835480Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:30.836543Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:13:31.263337Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:31.276407Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:31.276433Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:31.285219Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:31.308013Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:31.308946Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:31.308957Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:31.310664Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:31.350465Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:31.378750Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:31.378784Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:31.413035Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:31.509995Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:31.516578Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:31.516596Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:31.526380Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:31.558037Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:31.563026Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:31.563043Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:31.568547Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:31.583934Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:13:31.595750Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:13:31.595767Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:31.601522Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:13:31.618931Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:13:31.619600Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:13:31.619611Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:31.621590Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:13:31.631996Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:13:31.632535Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:31.632546Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:31.633569Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:13:31.638776Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:13:31.643722Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:13:31.762870Z  INFO local_candidate{attempt=38}: screened exchange table geometry expansion_ms=9300 expansion_and_footprint_ms=10664 estimated_row_bytes=37504 heuristic_row_bytes=106684 geometry_fragments_per_tile=4296 fragment_limit=16384
2026-09-12T18:13:31.898335Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:13:31.904534Z  INFO local_candidate{attempt=38}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:31.918325Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:13:31.918346Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:31.935919Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:13:31.992466Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:13:31.994876Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:13:31.994898Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:31.997594Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:13:32.076408Z  INFO local_candidate{attempt=40}: screened exchange table geometry expansion_ms=9663 expansion_and_footprint_ms=10981 estimated_row_bytes=37056 heuristic_row_bytes=105316 geometry_fragments_per_tile=4255 fragment_limit=16384
2026-09-12T18:13:32.144221Z  INFO local_candidate{attempt=33}: screened exchange table geometry expansion_ms=9667 expansion_and_footprint_ms=11042 estimated_row_bytes=37120 heuristic_row_bytes=106104 geometry_fragments_per_tile=4261 fragment_limit=16384
2026-09-12T18:13:32.193798Z  INFO local_candidate{attempt=34}: screened exchange table geometry expansion_ms=9831 expansion_and_footprint_ms=11090 estimated_row_bytes=37120 heuristic_row_bytes=106104 geometry_fragments_per_tile=4261 fragment_limit=16384
2026-09-12T18:13:32.197568Z  INFO local_candidate{attempt=44}: screened exchange table geometry expansion_ms=9487 expansion_and_footprint_ms=11102 estimated_row_bytes=37120 heuristic_row_bytes=106212 geometry_fragments_per_tile=4261 fragment_limit=16384
2026-09-12T18:13:32.224920Z  INFO local_candidate{attempt=40}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:32.273598Z  INFO local_candidate{attempt=33}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:32.319318Z  INFO local_candidate{attempt=34}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:32.321374Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:13:32.321402Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:32.355321Z  INFO local_candidate{attempt=44}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:32.356750Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:13:32.399078Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:32.423488Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:32.423510Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:32.455344Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:32.468327Z  INFO local_candidate{attempt=45}: screened exchange table geometry expansion_ms=10094 expansion_and_footprint_ms=11362 estimated_row_bytes=37064 heuristic_row_bytes=106212 geometry_fragments_per_tile=4256 fragment_limit=16384
2026-09-12T18:13:32.491031Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:32.492416Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:32.492439Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:32.496223Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:32.507506Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:13:32.507538Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:32.515384Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:32.516252Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:32.516266Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:32.516901Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:13:32.518439Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:32.573124Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:32.582019Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:32.597859Z  INFO local_candidate{attempt=45}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:32.616065Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:13:32.648485Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:13:32.648516Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:32.679930Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:13:32.714126Z  INFO local_candidate{attempt=31}: screened exchange table geometry expansion_ms=10302 expansion_and_footprint_ms=11611 estimated_row_bytes=37320 heuristic_row_bytes=106208 geometry_fragments_per_tile=4288 fragment_limit=16384
2026-09-12T18:13:32.724768Z  INFO local_candidate{attempt=35}: screened exchange table geometry expansion_ms=10331 expansion_and_footprint_ms=11630 estimated_row_bytes=37120 heuristic_row_bytes=106104 geometry_fragments_per_tile=4261 fragment_limit=16384
2026-09-12T18:13:32.753662Z  INFO local_candidate{attempt=28}: screened exchange table geometry expansion_ms=10337 expansion_and_footprint_ms=11650 estimated_row_bytes=37320 heuristic_row_bytes=105308 geometry_fragments_per_tile=4288 fragment_limit=16384
2026-09-12T18:13:32.821128Z  INFO local_candidate{attempt=30}: screened exchange table geometry expansion_ms=10434 expansion_and_footprint_ms=11721 estimated_row_bytes=37032 heuristic_row_bytes=105240 geometry_fragments_per_tile=4257 fragment_limit=16384
2026-09-12T18:13:32.855640Z  INFO local_candidate{attempt=31}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:32.857419Z  INFO local_candidate{attempt=35}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:32.895728Z  INFO local_candidate{attempt=27}: screened exchange table geometry expansion_ms=10579 expansion_and_footprint_ms=11792 estimated_row_bytes=36960 heuristic_row_bytes=103800 geometry_fragments_per_tile=4239 fragment_limit=16384
2026-09-12T18:13:32.901418Z  INFO local_candidate{attempt=28}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:32.949800Z  INFO local_candidate{attempt=30}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:33.032500Z  INFO local_candidate{attempt=27}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:33.123966Z  INFO local_candidate{attempt=42}: screened exchange table geometry expansion_ms=10675 expansion_and_footprint_ms=12022 estimated_row_bytes=37232 heuristic_row_bytes=106464 geometry_fragments_per_tile=4273 fragment_limit=16384
2026-09-12T18:13:33.241160Z  INFO local_candidate{attempt=26}: screened exchange table geometry expansion_ms=10908 expansion_and_footprint_ms=12139 estimated_row_bytes=36960 heuristic_row_bytes=103800 geometry_fragments_per_tile=4239 fragment_limit=16384
2026-09-12T18:13:33.255178Z  INFO local_candidate{attempt=42}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:33.360567Z  INFO local_candidate{attempt=29}: screened exchange table geometry expansion_ms=10904 expansion_and_footprint_ms=12256 estimated_row_bytes=37064 heuristic_row_bytes=105308 geometry_fragments_per_tile=4256 fragment_limit=16384
2026-09-12T18:13:33.371289Z  INFO local_candidate{attempt=26}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:33.485506Z  INFO local_candidate{attempt=37}: screened exchange table geometry expansion_ms=11051 expansion_and_footprint_ms=12390 estimated_row_bytes=37504 heuristic_row_bytes=106684 geometry_fragments_per_tile=4296 fragment_limit=16384
2026-09-12T18:13:33.504993Z  INFO local_candidate{attempt=29}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:33.523999Z  INFO local_candidate{attempt=25}: screened exchange table geometry expansion_ms=11184 expansion_and_footprint_ms=12424 estimated_row_bytes=36960 heuristic_row_bytes=103800 geometry_fragments_per_tile=4239 fragment_limit=16384
2026-09-12T18:13:33.548072Z  INFO local_candidate{attempt=41}: screened exchange table geometry expansion_ms=11109 expansion_and_footprint_ms=12449 estimated_row_bytes=37056 heuristic_row_bytes=105316 geometry_fragments_per_tile=4255 fragment_limit=16384
2026-09-12T18:13:33.581540Z  INFO local_candidate{attempt=32}: screened exchange table geometry expansion_ms=11112 expansion_and_footprint_ms=12479 estimated_row_bytes=37120 heuristic_row_bytes=106104 geometry_fragments_per_tile=4261 fragment_limit=16384
2026-09-12T18:13:33.635067Z  INFO local_candidate{attempt=37}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:33.660468Z  INFO local_candidate{attempt=25}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:33.704701Z  INFO local_candidate{attempt=41}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:33.717350Z  INFO local_candidate{attempt=32}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:33.757411Z  INFO local_candidate{attempt=39}: screened exchange table geometry expansion_ms=11284 expansion_and_footprint_ms=12658 estimated_row_bytes=37232 heuristic_row_bytes=105960 geometry_fragments_per_tile=4267 fragment_limit=16384
2026-09-12T18:13:33.807271Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:33.820701Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:33.820726Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:33.830621Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:33.853645Z  INFO local_candidate{attempt=43}: screened exchange table geometry expansion_ms=11336 expansion_and_footprint_ms=12758 estimated_row_bytes=37120 heuristic_row_bytes=106212 geometry_fragments_per_tile=4261 fragment_limit=16384
2026-09-12T18:13:33.868954Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:33.870931Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:33.870957Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:33.873371Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:33.899646Z  INFO local_candidate{attempt=39}: eliminated unread FP8 cast input padding clears removed=2084
2026-09-12T18:13:33.995699Z  INFO local_candidate{attempt=43}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:13:34.104287Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:34.114122Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:34.114163Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.115731Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:34.132023Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:34.132181Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:34.132225Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.147750Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:34.158088Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:34.176250Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:34.176289Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.180968Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:34.182098Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:34.182118Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.184195Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:34.187043Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:34.199186Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:34.203553Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:34.212622Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:34.212642Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.215369Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:34.216837Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:34.216861Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.216990Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:34.217009Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.219734Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:34.222720Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:34.226722Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:34.249388Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:34.250532Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:34.250545Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.252647Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:34.253555Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:34.254712Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:34.254724Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.256778Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:34.401762Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:34.409711Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:34.409731Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.420702Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:34.446386Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:34.454131Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:34.454152Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.454456Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:34.468944Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:34.471101Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:34.471142Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.483901Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:34.485439Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:34.488665Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:34.493589Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:34.493616Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.496791Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:34.496818Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.508146Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:34.510431Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:34.512811Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:34.513967Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:34.513980Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.516060Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:34.747712Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:34.755792Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:34.755815Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.764188Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:34.767018Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:34.769278Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:34.777639Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:34.777658Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.782821Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:34.782843Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.787714Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:34.793288Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:34.799372Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:13:34.815079Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:34.816262Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:34.816275Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.818433Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:34.820549Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:34.821716Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:34.821729Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.823922Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:34.850889Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:13:34.850915Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.906189Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:34.919652Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:34.919682Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.919885Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:34.929916Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:34.932544Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:13:34.933837Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:34.933860Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.944282Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:34.969968Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:34.971633Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:34.971659Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.975080Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:34.983231Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:34.985081Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:34.985103Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:34.987716Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:13:34.988832Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:35.006818Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:13:35.007364Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:35.007377Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.009031Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:13:35.021736Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:13:35.022379Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:35.022401Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.024067Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:13:35.032830Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:13:35.055327Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:13:35.056191Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:13:35.056219Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.058854Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:13:35.065385Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:35.072031Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.079471Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:35.079494Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.080925Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.080949Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.090493Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:35.092539Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:35.107447Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.115795Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.115814Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.122855Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:35.123784Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:35.125148Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:35.125161Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.127136Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:35.127378Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:35.127664Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:35.141159Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:35.141182Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.148972Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:35.148995Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.151775Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:35.181426Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:35.182726Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:35.182740Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.182929Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:35.185041Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:35.223437Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:35.225592Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:35.225621Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.225703Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.231612Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:35.237928Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.237953Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.248605Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:35.249419Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:35.249429Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.249814Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:35.251078Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:35.263274Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.273061Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.273083Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.285306Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:35.297187Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:35.307320Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:35.331842Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:35.346456Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:35.346487Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.360804Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:35.389236Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.397749Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:35.400082Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:35.400116Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.404482Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:35.405449Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.405494Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.421335Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:35.430367Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:35.431192Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.441257Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.441278Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.453420Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:35.453870Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:35.457518Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:35.457538Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.464346Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:35.467632Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:35.467653Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.471812Z  INFO local_candidate{attempt=36}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:13:35.478570Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:35.490446Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:35.490465Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.491515Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:35.507830Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:35.509080Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:35.509098Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.511298Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:35.523574Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:35.523653Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:35.524740Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:35.524755Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.524892Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:35.527592Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:35.530727Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:35.535477Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:35.538816Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:13:35.538842Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:35.543680Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:35.544392Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:35.544409Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.544459Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:35.544467Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.546129Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:35.552913Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:35.552934Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.554852Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:35.562379Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:35.562400Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.565093Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:13:35.565116Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:35.568383Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:13:35.573141Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:13:35.583965Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:35.585198Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:35.585228Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.587517Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:35.591465Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:35.596587Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:35.596907Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:35.603948Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:35.632879Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:35.638242Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:35.639266Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:35.639422Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:35.639435Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.640441Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:35.640455Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.642697Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:35.643626Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:35.643841Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:35.647848Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:35.653136Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.657845Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:35.657867Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.658557Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:35.659286Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:35.659296Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.659664Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:35.660445Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:35.660456Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.660891Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:35.662102Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:35.662504Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.662522Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.669019Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:35.674760Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:35.684837Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:35.698716Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:35.698738Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.700976Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:35.702417Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:35.702430Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.704863Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:35.705681Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:35.707152Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:35.709486Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:35.715474Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:35.716879Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:35.723684Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:35.737625Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:35.737651Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.738061Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:35.739340Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:35.739363Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.741585Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:35.744036Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.747785Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:35.749330Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:35.753184Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.753210Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.764688Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:35.772090Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:35.773394Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:35.773412Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.780968Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:35.782284Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:35.782297Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.784913Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:35.785259Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:35.785277Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.798622Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:35.816775Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:35.826890Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.835458Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.835477Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.845472Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:35.846966Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:35.847415Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:35.847444Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.848787Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:35.849957Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:35.849971Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.850493Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:35.852625Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:35.868216Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:35.868894Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:35.868903Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.870459Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:35.914198Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:35.923569Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:13:35.923952Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:35.936074Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:13:35.936095Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.947253Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.953109Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:13:35.956465Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.956482Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:35.968418Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:35.976049Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:35.991478Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:35.991519Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.005105Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:36.020891Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:36.038341Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:36.038376Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.053238Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:36.073283Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:36.087170Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:36.087450Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:36.093230Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:36.094954Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:36.094973Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.096816Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:36.096833Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.096951Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:36.096966Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.098246Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:36.099561Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:36.099578Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.108298Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:36.109983Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:36.134184Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:36.136031Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:36.161014Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:36.161036Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.180918Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:36.183511Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:36.183537Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.188959Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:36.203812Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:36.210744Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:36.211575Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:36.211585Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.213261Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:36.235460Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:36.236587Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:36.236600Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.239129Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:36.254726Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:36.255514Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:36.255524Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.257108Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:36.257865Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:36.267773Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:36.269248Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:36.294796Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:36.294819Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.301464Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:36.311093Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:36.328365Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:36.339126Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:36.361488Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:13:36.362775Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:36.362802Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=4 initial_horizon=496 selected_horizon=496 endpoint_lower_bound=288 lower_bound_gap=208 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:36.367047Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=4 tile=1431 row_words=13 horizon=496
2026-09-12T18:13:36.370659Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:36.370691Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.377663Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:13:36.377700Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.387635Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=5 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:13:36.387655Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=5 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:36.388868Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=5 tile=13 row_words=21 horizon=2978
2026-09-12T18:13:36.391491Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:13:36.408103Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:36.432063Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:36.433308Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:36.440693Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:36.441863Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:36.441876Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.443034Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:36.444423Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:36.460419Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:36.461220Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:36.461230Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.462866Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:36.467250Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:36.467280Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.508342Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:36.512189Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:36.517370Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:36.518701Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:36.545035Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:36.545077Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.563003Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:36.564328Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:36.564342Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.567052Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:36.583056Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:36.583319Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:36.583866Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:36.583875Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.585455Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:36.619110Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:36.620585Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:36.620605Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.623113Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:36.631281Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:36.640330Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:36.640980Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:36.641266Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:36.641276Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.643048Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:36.659951Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:36.687419Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:36.687446Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.695783Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:36.706392Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:36.721952Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:36.766458Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:36.767782Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:36.767797Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.770531Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:36.786962Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:36.787716Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:36.787726Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.789427Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:36.796793Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:36.822782Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:36.822806Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.840696Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:36.851296Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:36.852914Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:13:36.856132Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:36.860214Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:36.885921Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:36.885943Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.888006Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:36.889190Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:36.889221Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.892414Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:36.894344Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:13:36.894369Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.908325Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:36.909113Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:36.909129Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.910724Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:36.919344Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:36.943230Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:13:36.950354Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:36.951623Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:36.951644Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.955960Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:36.958494Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:36.973897Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:36.978488Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:36.979175Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:36.979183Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:36.980691Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:36.986783Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:36.988219Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:13:37.006820Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:37.014148Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:37.014170Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.019055Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:37.019075Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.024722Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:37.033188Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:37.033220Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.034112Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:37.047084Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:37.054586Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:13:37.067163Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:37.078060Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:37.079161Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:37.079174Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.081705Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:37.085240Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:13:37.085828Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:37.086146Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:13:37.086168Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.088505Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:13:37.096791Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:37.097464Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:37.097474Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.099004Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:37.110710Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:13:37.110731Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:37.112806Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:37.112829Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.113919Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:13:37.114383Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:13:37.121840Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:13:37.121869Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.131441Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:37.131791Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:13:37.142333Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:13:37.143233Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:37.146348Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:37.152782Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:37.154263Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:13:37.154281Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:37.155400Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:13:37.165438Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:13:37.168849Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:37.168892Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.175384Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:13:37.178856Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:13:37.178882Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.182713Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:13:37.183152Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:13:37.183416Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:13:37.183436Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.185665Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:13:37.188698Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:37.190176Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:37.190190Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.191769Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:13:37.193058Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:37.198793Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:37.209363Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:37.209386Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:37.209673Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:37.210232Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:37.210242Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.211900Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:37.240341Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:13:37.251650Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:37.253579Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:37.253601Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.258392Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:37.260629Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:37.270569Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:37.286729Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:37.288106Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:37.288125Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.290561Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:37.297738Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:13:37.297767Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.352975Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:37.366107Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:37.380801Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:13:37.409744Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:37.409776Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.443120Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:13:37.474922Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:13:37.476014Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:13:37.476028Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.478741Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:13:37.483930Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:13:37.500548Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:13:37.501396Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:13:37.501408Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.503096Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:13:37.539606Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:13:37.540966Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:13:37.540980Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.544001Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:13:37.553376Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:13:37.564422Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:13:37.628038Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:13:37.649550Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:13:37.649577Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:37.666580Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:13:37.731309Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:13:38.693861Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:13:38.717944Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:13:38.717987Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:38.740421Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:13:38.810657Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:13:38.813156Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:13:38.813174Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:38.816627Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:13:39.213235Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:13:39.235725Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:13:39.235750Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:39.252134Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:13:39.305807Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:13:39.308194Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:13:39.308225Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:39.311882Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:13:39.507376Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:13:39.539156Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:13:39.539184Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:39.572504Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:13:39.836995Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:13:39.881536Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:13:39.881563Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:39.922314Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:13:39.976177Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:13:40.005603Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:13:40.005638Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:40.036492Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:13:40.122662Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:13:40.122697Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:40.137062Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:13:40.981683Z  INFO local_candidate{attempt=36}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:41.106710Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:41.106748Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:41.153542Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:41.472170Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:41.488705Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:13:41.497214Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:41.497238Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:41.536363Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:41.549304Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:13:41.549332Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:41.619191Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:13:41.670359Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:13:41.686438Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:13:41.686930Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:41.686941Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:41.688539Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:13:41.699990Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:13:41.700469Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:41.700481Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:41.701577Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:13:41.707382Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:13:41.728932Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:13:41.730216Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:13:41.730239Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:41.734312Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:13:41.887638Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:13:41.950982Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:13:41.951021Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:42.058508Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:13:42.109688Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:13:42.131588Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:13:42.132288Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:42.132305Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:42.134344Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:13:42.148758Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:13:42.149488Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:42.149505Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:42.150718Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:13:42.158090Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:13:42.176292Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:13:42.177761Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:13:42.177782Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:42.180452Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:13:43.448917Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:13:43.487622Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:13:43.487646Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:43.544732Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:13:43.608714Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:43.711327Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:13:43.719368Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:13:43.719424Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:43.727971Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:43.728015Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:43.730495Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:13:43.743902Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:13:43.749635Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:13:43.751810Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:13:43.752833Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:13:43.762141Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:13:43.777579Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:13:43.777976Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:43.777985Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:43.779665Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:13:43.783892Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:43.790483Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:13:43.790900Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:43.790907Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:43.792019Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:13:43.797471Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:13:43.802591Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:13:43.804073Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:13:43.804896Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:13:43.816186Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:13:43.819293Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:43.881828Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:13:43.886171Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:13:43.886188Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:43.893483Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:13:43.913519Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:13:43.914256Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:13:43.914277Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:43.916173Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:13:43.917106Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:13:43.917114Z  INFO local_candidate{attempt=33}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:43.940997Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:43.941035Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:43.944357Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:13:43.945177Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:13:43.945188Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:43.946989Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:13:43.954339Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:13:43.954359Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:43.986435Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:43.990910Z  INFO local_candidate{attempt=44}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:44.002346Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:13:44.032481Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:44.032510Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:44.064827Z  INFO local_candidate{attempt=34}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:44.077817Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:44.093601Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:44.109253Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:44.109335Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:44.116563Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:44.141217Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:44.141241Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.157436Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:44.166911Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:44.166944Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.169695Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:44.173554Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:13:44.179776Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:13:44.179795Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.186602Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:44.186625Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:44.187352Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:13:44.198158Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:13:44.210752Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:13:44.210772Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:44.211926Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:13:44.219840Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:13:44.227224Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:13:44.231919Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:44.241056Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:13:44.241516Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:44.241531Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.243118Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:13:44.254132Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:13:44.254595Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:44.254604Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.255785Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:13:44.260499Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:44.261437Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:13:44.266688Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:13:44.268197Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:13:44.268996Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:13:44.279991Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:13:44.290342Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:44.314038Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:44.314890Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:44.314903Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.316899Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:44.322590Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:44.322612Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.350089Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:44.353886Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:13:44.358046Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:13:44.358062Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.364921Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:13:44.378197Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:13:44.378651Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:13:44.378658Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.379816Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:13:44.392100Z  INFO local_candidate{attempt=45}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:44.405928Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:13:44.406727Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:13:44.406738Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.408419Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:13:44.417723Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:13:44.417894Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:44.418097Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:13:44.418102Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.419197Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:13:44.449827Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:44.449860Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.456297Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:44.487356Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:13:44.487398Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:44.487867Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:44.489049Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:44.489073Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.510844Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:44.510895Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:44.517377Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:44.557678Z  INFO local_candidate{attempt=31}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:44.557866Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:44.570226Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:44.581917Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:44.581947Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.590822Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:13:44.611682Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:44.679773Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:44.679811Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:44.709151Z  INFO local_candidate{attempt=30}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:44.724894Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:44.805792Z  INFO local_candidate{attempt=35}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:44.829483Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:44.829516Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:44.875233Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:44.901237Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:44.919465Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:44.919490Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:44.924646Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:44.924667Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:44.960456Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:44.971349Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:45.035625Z  INFO local_candidate{attempt=28}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:45.091868Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:45.126004Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:13:45.127712Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:45.127742Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.138630Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:13:45.138654Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.145318Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:13:45.156107Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:45.164023Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:45.164052Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.166523Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:13:45.167428Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:13:45.167440Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.169475Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:13:45.181756Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:13:45.182315Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:45.182325Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.183456Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:13:45.185382Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:45.189096Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:13:45.194446Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:13:45.197257Z  INFO local_candidate{attempt=42}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:45.205062Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:13:45.205594Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:13:45.205605Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.206962Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:13:45.209499Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:45.209516Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.211721Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:45.238669Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:45.259665Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:13:45.275055Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:45.306737Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:45.306769Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.323475Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:45.323501Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.335474Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:45.348399Z  INFO local_candidate{attempt=25}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:45.371143Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:45.431967Z  INFO local_candidate{attempt=26}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:45.472029Z  INFO local_candidate{attempt=27}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:45.473127Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:45.473153Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.510139Z  INFO local_candidate{attempt=29}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:45.519218Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:45.534405Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:45.537047Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:13:45.558867Z  INFO local_candidate{attempt=31}: compared ordinary and paired exchange schedules phase=60 candidates=948 ordinary_horizon=531 paired_horizon=2883 use_paired=false
2026-09-12T18:13:45.559616Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:45.559633Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.561661Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:45.561689Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.569750Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:13:45.569770Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.585734Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:13:45.585764Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.588792Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:45.592633Z  INFO local_candidate{attempt=37}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:45.594773Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:13:45.613563Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:13:45.619550Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:45.620255Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:45.620282Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.632820Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:13:45.632855Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.634555Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:45.634581Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.636126Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:13:45.640288Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:13:45.640963Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:13:45.640971Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.642475Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:13:45.657322Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:45.657344Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.659102Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:13:45.687784Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:45.693124Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:45.717753Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:45.721408Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:45.721438Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.724090Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:45.742811Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:13:45.743947Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:45.743965Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.776001Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:45.780654Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:45.840907Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:45.860840Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:45.860880Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:45.865410Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:45.865437Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:45.895152Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:45.926024Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:45.932856Z  INFO local_candidate{attempt=41}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:45.956124Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:45.989726Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:45.989762Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.005142Z  INFO local_candidate{attempt=43}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:46.025343Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:46.029008Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:46.039168Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:46.051631Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:46.051656Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.065820Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:46.065843Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.074000Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:46.074030Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:46.082003Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:46.095158Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:46.097641Z  INFO local_candidate{attempt=32}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:13:46.100595Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:46.129924Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:46.129972Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:46.132785Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:46.132816Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.143853Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:46.163987Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:46.179242Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:46.241338Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:13:46.241372Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:46.295486Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:46.308306Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:13:46.321712Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:46.323446Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:46.323465Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.349615Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:46.349650Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.352171Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:46.385287Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:46.481711Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:13:46.501915Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:13:46.501942Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.518126Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:13:46.520086Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:46.521134Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:46.555283Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:46.555317Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.557115Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:46.557145Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.560691Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:46.569240Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:46.569262Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.577094Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:13:46.579482Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:13:46.579506Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.579600Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:46.582400Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:13:46.585824Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:46.589973Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:46.671292Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:13:46.704050Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:13:46.704096Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.735655Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:46.737910Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:13:46.804483Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:46.804572Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.906486Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:46.952663Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:46.956505Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:46.957877Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:46.957910Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:46.961535Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:47.007308Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:13:47.027367Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:13:47.027393Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.043348Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:13:47.047967Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:47.048003Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.083612Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:47.092702Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:13:47.095343Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:13:47.095387Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.099699Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:13:47.117760Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:47.157846Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:47.157882Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.161883Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:47.195623Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:47.195658Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.206818Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:47.207650Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:47.207663Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.210010Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:47.262603Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:47.264037Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:13:47.293186Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:13:47.293234Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.298437Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:47.314652Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:47.315947Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:47.315968Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.319736Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:47.322558Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:13:47.346972Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:47.348079Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:47.348105Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.351624Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:47.422926Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:47.495448Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:47.495497Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.596834Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:47.647654Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:47.648539Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:47.648553Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.650560Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:47.734472Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:47.740693Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:47.761631Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:13:47.793791Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:13:47.793819Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.810844Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:47.810879Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.814695Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:47.814722Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.816051Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:47.824676Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:13:47.881468Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:47.881491Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.913464Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:47.919702Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:47.920712Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:47.968692Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:47.969600Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:47.969614Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:47.971730Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:47.975521Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-12T18:13:47.975546Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:47.977852Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:47.989505Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:47.994569Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:47.994597Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.037720Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:48.038639Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:48.038653Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.041088Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:48.100221Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:48.141039Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:48.210576Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:48.210610Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.314794Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:48.360607Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:48.361841Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:48.361868Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.364404Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:48.412654Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:48.492981Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:48.493016Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.516380Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:48.582465Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:48.582492Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.620389Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:48.666411Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:48.667283Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:48.667297Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.669794Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:48.696319Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:48.714073Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:48.738077Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:48.741448Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:48.742289Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:48.743106Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:48.743116Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.745295Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:48.755361Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:48.780107Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:48.780133Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.807759Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:48.807784Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.809781Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:48.809812Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.830724Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:48.830912Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.886088Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:48.916338Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:48.925547Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:48.930699Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:48.933270Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:48.934154Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:48.934166Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.936422Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:48.964910Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:48.965930Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:48.965944Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.968594Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:48.977886Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:48.979700Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:48.979730Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.983823Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:48.984239Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:48.985726Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:48.985747Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:48.989232Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:49.106701Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:49.179038Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:49.182277Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:49.182308Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.263566Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:49.263608Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.274977Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:13:49.298822Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:49.335536Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:13:49.335573Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.369854Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:49.371362Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:49.371387Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.375372Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:49.402755Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:49.405495Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:13:49.457035Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:49.457924Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:49.457938Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.459952Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:13:49.460432Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:49.475982Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:13:49.476906Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:13:49.477472Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:49.477484Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.479506Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:13:49.491526Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:13:49.491987Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:49.491998Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.493046Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:13:49.499432Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:13:49.515406Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:13:49.516394Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:13:49.516406Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.518593Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:13:49.549100Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:49.549153Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.636469Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:49.636513Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:49.657694Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:49.719961Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:49.721107Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:49.721123Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.723954Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:49.734406Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:49.784960Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:49.786046Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:49.786059Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.788597Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:49.809019Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:13:49.869401Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:13:49.869437Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:49.953467Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:13:50.000371Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:13:50.016686Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:13:50.017250Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:50.017263Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:50.018861Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:13:50.030324Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:13:50.030782Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:50.030790Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:50.031846Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:13:50.037689Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:13:50.054479Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:13:50.055361Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:13:50.055375Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:50.057811Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:13:50.743990Z  INFO local_candidate{attempt=37}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:13:50.811164Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:50.811984Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:13:50.812023Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:50.850454Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:13:50.889786Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:50.889821Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:50.943689Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:50.950080Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:51.024565Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:51.030124Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:51.030160Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.090508Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:51.090539Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.142105Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:51.192288Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:51.195425Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:51.230961Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:13:51.248523Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:13:51.248559Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.262859Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:51.267764Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:51.267796Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.271637Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:13:51.327705Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:51.327728Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.363178Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:51.404138Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:13:51.428749Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:51.446798Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:13:51.446837Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.503239Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:13:51.687924Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:13:51.694385Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:13:51.694406Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.702406Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:13:51.713881Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:13:51.719941Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:13:51.722307Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:13:51.723435Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:13:51.732480Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:13:51.748588Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:13:51.749054Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:51.749062Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.751263Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:13:51.764167Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:13:51.764871Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:51.764899Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.766782Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:13:51.776188Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:13:51.784880Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:13:51.786785Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:13:51.787600Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:13:51.803794Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:13:51.875435Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:13:51.879598Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:13:51.879618Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.887165Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:13:51.906019Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:13:51.906995Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:13:51.907015Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:51.908957Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:13:51.925007Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:51.935026Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=59 transfers=2047 maximum_identical_destinations=1
2026-09-12T18:13:51.935056Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=59 initial_horizon=174 selected_horizon=174 endpoint_lower_bound=64 lower_bound_gap=110 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:51.936870Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=59 tile=1112 row_words=38 horizon=174
2026-09-12T18:13:51.961380Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:51.988895Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:51.988930Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.046894Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:52.046928Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.069242Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:52.093241Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:52.146071Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:52.146107Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.152895Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:13:52.152930Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:52.188048Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:52.247042Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:52.249699Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:13:52.302905Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:13:52.304191Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:13:52.304222Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.306582Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:13:52.365567Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:52.419957Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:13:52.440447Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:52.440484Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.452806Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:13:52.452832Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.455378Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:13:52.490231Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:13:52.503966Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:13:52.503997Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.515847Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:13:52.516837Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:13:52.516858Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.518953Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:13:52.545068Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:52.572834Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:13:52.588707Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:13:52.591356Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:13:52.591373Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.594160Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:13:52.647738Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:52.721939Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:52.721969Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.742276Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:52.802119Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:52.802144Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.812948Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:52.819871Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:13:52.827923Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:13:52.827948Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.839243Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:13:52.854731Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:13:52.862815Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:13:52.865866Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:13:52.867275Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:13:52.874410Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:52.878447Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:13:52.879785Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:52.897968Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:52.898418Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:13:52.899027Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:52.899041Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.899780Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:52.902014Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:13:52.919057Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:13:52.919676Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:52.919690Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.921416Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:13:52.929870Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:13:52.937127Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:52.937146Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.937393Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:13:52.939478Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:13:52.940479Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:13:52.944195Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:52.944228Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.956592Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:13:52.966632Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:52.966667Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:52.992521Z  INFO local_candidate{attempt=29}: compared ordinary and paired exchange schedules phase=60 candidates=972 ordinary_horizon=528 paired_horizon=2983 use_paired=false
2026-09-12T18:13:53.003544Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:13:53.026603Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=60 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:13:53.026647Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=60 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:53.033049Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:13:53.033084Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.034156Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=60 tile=1017 row_words=95 horizon=528
2026-09-12T18:13:53.042181Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:53.053158Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:13:53.057768Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:53.061275Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:13:53.065507Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:13:53.065537Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:53.067034Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:13:53.067054Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.068765Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:13:53.071937Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:53.078320Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:13:53.090497Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:53.090524Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:53.092447Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:13:53.098715Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:13:53.099412Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:13:53.099427Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.101301Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:13:53.126570Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:13:53.127100Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:13:53.127111Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.128501Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:13:53.138545Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:53.143124Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:13:53.144466Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:13:53.144483Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.146927Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:13:53.161294Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:13:53.161855Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:13:53.161867Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.163677Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:13:53.187606Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:13:53.206230Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:53.206265Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:53.211111Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:53.211143Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.242589Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:53.306477Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:53.321152Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:53.393340Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:53.393374Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.485111Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:53.588849Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:53.652509Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:53.652542Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.673712Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:13:53.685670Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:53.711584Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:53.736709Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:53.736733Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.741906Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:53.752741Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:53.752771Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.760620Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:13:53.760657Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:53.783012Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:53.783038Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:53.790654Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:13:53.808467Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:53.836008Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:53.840537Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:13:53.931678Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:53.943082Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:13:53.943126Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:53.955141Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:13:53.965273Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:54.005321Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:54.005351Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:54.031595Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:54.031620Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:54.056082Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:54.083061Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:54.200612Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:13:54.217534Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:13:54.217565Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:54.228364Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:13:54.262134Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:13:54.263406Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:13:54.263425Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:54.266994Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:13:54.286559Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:13:54.287505Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:54.287527Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:54.289605Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:13:54.299360Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:13:54.307768Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:13:54.373742Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:13:54.393894Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:13:54.393921Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:54.409476Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:13:54.470905Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:13:54.473132Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:13:54.473148Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:54.475615Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:13:54.511374Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:54.546709Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:54.546732Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:54.593430Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:54.643167Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=30 success=true
2026-09-12T18:13:54.646173Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:13:54.652574Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:13:54.680680Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:54.708563Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:54.752433Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:54.752462Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:54.781085Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:54.781119Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:54.803338Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:54.833103Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:55.034249Z  INFO local_candidate{attempt=36}: exchange table and repeat patch storage exchange_table_bytes=27960 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:13:55.046525Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:55.100742Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:13:55.119036Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:55.119064Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.122380Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:13:55.122399Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.151908Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:13:55.170861Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:55.182169Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:55.212809Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:55.212835Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.253699Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:55.303086Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:55.368676Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:55.368698Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.374444Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:55.431372Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:55.448908Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:55.448940Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.476639Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:55.484142Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:55.484177Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.492602Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:55.499821Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:55.508407Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:55.540369Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:55.582396Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:55.582427Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.612965Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:55.613000Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.620904Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:55.635234Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:55.640177Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:55.664869Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:55.687813Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:55.687837Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.725250Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:55.725280Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.740753Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:55.787119Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:55.796730Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:55.864652Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:55.864690Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:55.918870Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:55.918913Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:55.937609Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:55.955104Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:55.955140Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:55.960974Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:55.990897Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:56.006912Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:56.073412Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:56.073436Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:56.143065Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:56.225329Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:56.225363Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:56.231168Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:56.231216Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:56.269541Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:56.273889Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:56.331538Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:56.338728Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:13:56.398663Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:56.398692Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:56.407521Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:13:56.407568Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:56.460132Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:56.474126Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:13:57.023001Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:13:57.036274Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:57.036318Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:57.042608Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:57.042641Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:57.069834Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:57.072916Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:13:57.072947Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:57.076048Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:57.156925Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:13:57.193271Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:57.199812Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:13:57.215313Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:13:57.215778Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:57.215789Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:57.217615Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:13:57.228284Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:13:57.228685Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:57.228692Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:57.229694Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:13:57.230737Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:57.230757Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:57.235585Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:13:57.249823Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:13:57.250646Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:13:57.250655Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:57.252397Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:13:57.269058Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:57.299365Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:57.329007Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:57.329046Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:57.346389Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:57.346419Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:57.363089Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:57.384626Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:57.488857Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:57.535842Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:57.535870Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:57.575411Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:57.575598Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:57.612547Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:57.612581Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:57.651181Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:57.666523Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:57.666561Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:57.682425Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:57.682470Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:57.708336Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:57.713087Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:57.713121Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:57.746068Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:57.785731Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:13:57.844610Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:57.844647Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:57.863183Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=795 success=true
2026-09-12T18:13:57.863235Z  INFO local_candidate{attempt=36}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27960 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:13:57.863248Z  INFO local_candidate{attempt=36}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27960 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:13:57.891092Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:57.927562Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:57.946171Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:57.946231Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:57.953194Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:57.953232Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:57.981335Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:57.984763Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:57.984792Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:57.986579Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:58.019432Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:58.036473Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:58.036517Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:58.065217Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:58.079976Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:58.093317Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:58.093344Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.119113Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:58.133159Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:58.138242Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:58.138261Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.143638Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:58.200971Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:58.217865Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:13:58.235535Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:58.235568Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.261630Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:58.276924Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:58.281966Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:58.281986Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.287516Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:58.287772Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:58.316079Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:13:58.316107Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.319004Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:58.320579Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:58.320608Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:58.323511Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:58.323530Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.329239Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:58.343251Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:58.343270Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.356261Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:58.356290Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:58.356430Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:58.361949Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:58.364899Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:58.364917Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.368333Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:58.389396Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:58.405176Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:58.405221Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:58.413453Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:58.413494Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.422427Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:58.503643Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:13:58.542120Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:58.547096Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:58.547117Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.552676Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:58.569916Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:58.570264Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:13:58.572220Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:13:58.572242Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.576571Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:13:58.617638Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:58.617667Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.655384Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:58.747379Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:58.747412Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:58.775694Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:13:58.775743Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:58.792161Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:58.814779Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:13:58.887464Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1024 success=true
2026-09-12T18:13:58.945473Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:58.977840Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:58.979755Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:58.990111Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:58.990140Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:58.996277Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:13:59.005883Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:59.005903Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.015150Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:59.015170Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.030742Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:59.032051Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:59.032993Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:13:59.033012Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.043196Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:59.053250Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:59.069385Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:59.069408Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.081286Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:13:59.096293Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:59.178266Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:59.186613Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:59.191542Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:59.191562Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.196962Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:59.204187Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:59.224244Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:59.224267Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.240442Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:59.240463Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.249545Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:59.253407Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:13:59.255084Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:59.255108Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.262176Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:13:59.262217Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.263295Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:59.266660Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:59.267392Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:59.272945Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:13:59.286770Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:13:59.287490Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:59.288960Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:59.292490Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:13:59.294615Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:13:59.295593Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:13:59.297449Z  INFO local_candidate{attempt=29}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:13:59.302114Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:13:59.302143Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:59.304476Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:13:59.311319Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:59.311341Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.315662Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:59.315679Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.319008Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:13:59.319437Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:13:59.319447Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.321405Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:13:59.327613Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:59.331816Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:13:59.332232Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:13:59.332240Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.333306Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:13:59.338722Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:13:59.341424Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:59.343671Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:13:59.345052Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:13:59.345731Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:13:59.350312Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:13:59.351364Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:13:59.351814Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:59.356134Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:13:59.364478Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:59.364498Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.379530Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:13:59.379566Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:13:59.393089Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:13:59.402118Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:59.409539Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:13:59.420305Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:13:59.424568Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:13:59.424582Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.431918Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:13:59.445717Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:13:59.446216Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:13:59.446226Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.447433Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:13:59.486155Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:13:59.487686Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:13:59.487713Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.490275Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:13:59.494630Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:59.499861Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:59.499877Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.505996Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:59.636718Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:59.678002Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:59.678043Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.684265Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:13:59.687085Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:59.698549Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:13:59.698577Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.711729Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:13:59.712241Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:13:59.712371Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:59.712392Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.718223Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:13:59.721089Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:59.738350Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:13:59.738374Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.746156Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:59.754684Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:13:59.756502Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:13:59.756531Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.760140Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:13:59.762041Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:13:59.762080Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.773581Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:13:59.778857Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:13:59.791491Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:13:59.791515Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.809100Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:13:59.810870Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:13:59.905933Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:59.913513Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:59.913555Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.924807Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:13:59.984456Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:13:59.989755Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:13:59.989777Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:13:59.995662Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:00.001754Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:00.005437Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:00.029461Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:00.029495Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.033523Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:00.042757Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:00.042782Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.044618Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:00.046357Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:00.046384Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.056584Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:00.065428Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:00.074151Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:00.074191Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.087651Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:00.091981Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:00.104044Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:00.125003Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:00.125028Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.169844Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:00.233092Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:00.238665Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:00.238687Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.244990Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:00.254323Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:00.259435Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:00.259453Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.265672Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:00.385175Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:00.414544Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:00.414581Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.448669Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:00.450691Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:00.481968Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:00.493421Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:00.493450Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.509229Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:00.509253Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.535885Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:00.542889Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:00.645774Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:00.651819Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:00.651842Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.658672Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:00.702982Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:00.708414Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:00.708447Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.714380Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:00.736663Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:00.758547Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:00.758572Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.760407Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:00.760441Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:00.774302Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:00.778526Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:00.789547Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:00.823820Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:00.823854Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.841512Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:00.844413Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:00.844450Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:00.844600Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:00.847670Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:00.847697Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.852998Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:00.853218Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:00.866677Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:00.866704Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.871015Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:00.871040Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.872033Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:00.872052Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.884889Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:00.898385Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:00.909458Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:00.935070Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:00.935743Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:00.935757Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.937047Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:00.957026Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:00.959422Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:00.959441Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:00.962944Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:00.999434Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:01.003132Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:01.003233Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:01.007780Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:01.026291Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:01.031759Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:01.031785Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:01.038140Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:01.061419Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:01.066689Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:01.066717Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:01.072579Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:01.074158Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:01.100777Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:01.100804Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:01.135643Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:01.167033Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:01.168127Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:01.168142Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:01.170673Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:01.186056Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:01.186787Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:01.186797Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:01.188386Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:01.245049Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:01.248066Z  INFO local_candidate{attempt=28}: compared ordinary and paired exchange schedules phase=60 candidates=948 ordinary_horizon=531 paired_horizon=2883 use_paired=false
2026-09-12T18:14:01.254966Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:01.284766Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:14:01.284806Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:01.295875Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:14:01.332480Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:01.332514Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:01.335912Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:01.359558Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:01.359587Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:01.361340Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:14:01.442073Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:01.462571Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:01.462593Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:01.475554Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:01.526427Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:01.550999Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:01.551037Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:01.581473Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:01.652997Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:01.678112Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:01.678136Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:01.709122Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:01.833478Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:01.891039Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:01.891067Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:01.918057Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:02.029584Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:02.034422Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:02.034454Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:02.072003Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:02.072044Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:02.079478Z  INFO local_candidate{attempt=44}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:02.098814Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:02.098843Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:02.099829Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:02.128887Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:14:02.134621Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:02.134657Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:02.148075Z  INFO local_candidate{attempt=34}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:02.158403Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:02.158440Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:02.158537Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:02.158609Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:02.189168Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:02.212765Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:02.212835Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:02.240969Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:02.262445Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:02.262480Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:02.270463Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:02.284107Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:02.297089Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:02.297128Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:02.318841Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:02.318876Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:02.319763Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:02.326656Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:02.396245Z  INFO local_candidate{attempt=33}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:02.454641Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:02.454674Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:02.482315Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:02.522540Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:02.534788Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:02.534811Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:02.560291Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:02.570766Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:02.582070Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:02.582095Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:02.599321Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:02.874455Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:02.889694Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:02.889731Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:02.916624Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:02.921144Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:02.921186Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=13 initial_horizon=12868 selected_horizon=12868 endpoint_lower_bound=11940 lower_bound_gap=928 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:02.974420Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-12T18:14:03.000145Z  INFO local_candidate{attempt=31}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:03.059259Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:03.059298Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:03.086431Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:03.168940Z  INFO local_candidate{attempt=35}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:03.243731Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:03.243774Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:03.282724Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:03.377807Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:03.394668Z  INFO local_candidate{attempt=28}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:03.409269Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:03.409294Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.446408Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:03.475086Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:03.475120Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:03.479116Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:03.479688Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:03.479703Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.480989Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:03.497702Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:03.503516Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:03.512490Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:03.512523Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.535410Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:03.539651Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:03.542069Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:03.542088Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.544896Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:03.563666Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:03.625383Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:03.625430Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.639355Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:03.651471Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:03.651503Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.655061Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:03.662191Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:03.669350Z  INFO local_candidate{attempt=25}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:03.669463Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:03.685401Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:03.685427Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.688517Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:03.711234Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:03.716531Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:03.716562Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.719018Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:03.719039Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.722877Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:03.736061Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:03.736091Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:03.746297Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:03.747150Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:03.747167Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.749146Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:03.762942Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:03.763581Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:03.773212Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:03.786657Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:03.787413Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:03.787436Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.789557Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:03.795573Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:03.798128Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:03.798943Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:03.798961Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.800994Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:03.806603Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:03.807040Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:03.807051Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.808145Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:03.813714Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:03.816802Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:03.820371Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:03.820395Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.824568Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:03.830717Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:03.831603Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:03.831622Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.834465Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:03.840955Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:03.846024Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:03.857755Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:03.857774Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.862133Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:03.862617Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:03.862630Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.864976Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:03.873309Z  INFO local_candidate{attempt=42}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:03.875415Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:03.881132Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:03.881683Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:03.881699Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.883123Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:03.883183Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:03.886397Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:03.886424Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.890155Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:03.891225Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:03.912396Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:03.913305Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:03.913326Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:03.916307Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:03.943596Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:03.943632Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:03.970997Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:03.971859Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:03.992353Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:03.992375Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.001243Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:04.005620Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:04.032473Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:04.032499Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.085148Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:04.086157Z  INFO local_candidate{attempt=45}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:04.116126Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:04.116895Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:04.116913Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.118934Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:04.155695Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:04.155730Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:04.177313Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:04.179512Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:04.182424Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:04.182449Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.183849Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:04.186260Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:04.188888Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:04.188912Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.196761Z  INFO local_candidate{attempt=26}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:04.207290Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:04.273507Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:04.273541Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:04.282417Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:04.301801Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:04.302952Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:04.302972Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.315876Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:04.322834Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:04.338188Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:04.343328Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:04.343348Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.350857Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:04.350878Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.356789Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:04.368974Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:04.509052Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:04.509088Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:04.541850Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:04.544145Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:14:04.555104Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:04.555140Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.581955Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:04.595641Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:04.618096Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:04.618130Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.626032Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:04.632338Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:04.655781Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:04.655803Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.659692Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:04.671739Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:04.671764Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.683589Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:04.692550Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:04.692670Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:04.715850Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:04.716403Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:04.716413Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.717735Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:04.744665Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:04.744713Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:04.747613Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:04.747663Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:04.766023Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:04.777989Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:04.780096Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:04.782578Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:04.785085Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:04.785102Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.787973Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:04.807433Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:04.807469Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.824056Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:04.844917Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:04.875642Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:04.876497Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:04.876514Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.878525Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:04.895299Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:04.895329Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.926441Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:04.926487Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:04.935723Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:04.944349Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:04.947423Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:04.947444Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:04.951261Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:04.953849Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:04.956993Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:04.957470Z  INFO local_candidate{attempt=32}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:04.984883Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:04.984914Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.008950Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:05.008988Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.028885Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:05.028917Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.029780Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:05.032789Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:05.044055Z  INFO local_candidate{attempt=43}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:05.055195Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:05.055243Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.058408Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:05.058533Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:05.059375Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:05.059409Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.061624Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:05.089809Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:05.114405Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:05.114449Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.126269Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:05.128784Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:05.128801Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.131709Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:05.142649Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:05.154399Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:05.166623Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:05.166643Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.185026Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:05.194525Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:05.194559Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.198734Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:05.201821Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:05.219559Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:05.219583Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.238805Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:05.243286Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:05.243329Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.252199Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:05.261030Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:05.261064Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.281775Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:05.299398Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:05.301682Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:14:05.312600Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:05.312619Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.352883Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:05.362322Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:05.362362Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.372460Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:05.372494Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.376153Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:05.376740Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:05.376754Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.378150Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:05.388736Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:05.402425Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:05.416257Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:05.416341Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.420874Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:05.431939Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:05.435869Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:05.435899Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.460419Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:05.464610Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:05.501081Z  INFO local_candidate{attempt=27}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:05.521004Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:05.534361Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:05.534398Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.538557Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:05.552534Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:05.555865Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:05.570212Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:05.570242Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.570339Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:05.570365Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.576864Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:05.576892Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.577475Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:05.579903Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:05.579934Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.589470Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:05.616714Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:05.619304Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:05.645839Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:05.646455Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:05.646468Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.647924Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:05.687977Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:05.690667Z  INFO local_candidate{attempt=25}: compared ordinary and paired exchange schedules phase=22 candidates=18 ordinary_horizon=2545 paired_horizon=2362 use_paired=false
2026-09-12T18:14:05.695021Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:05.702359Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:05.702382Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:05.706457Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:05.716738Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:05.719138Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:05.719154Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.721867Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:05.727659Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:05.727687Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.736349Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:05.736377Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.772818Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:05.789864Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:05.797177Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:05.813188Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:05.813236Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.824730Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:05.830758Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:05.858589Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:05.858621Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.862283Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:05.869644Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:05.869672Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.892887Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:05.893413Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:05.893424Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.894841Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:05.898300Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:05.915412Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:05.924629Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:05.925364Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:05.925381Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.926962Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:05.960443Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:05.964047Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:05.964073Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.971054Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:05.988362Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:05.989794Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:05.995247Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:05.995273Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:05.995866Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:05.995883Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.003941Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:06.004533Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:06.015914Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:06.018189Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:06.021081Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:06.023011Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:06.023846Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:06.026144Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:06.029054Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:06.030066Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:06.031999Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:06.039668Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:06.045688Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:06.046064Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:06.046071Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.048630Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:06.060626Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:06.061183Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:06.061197Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.062306Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:06.062683Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:06.062693Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.063843Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:06.064244Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:06.069046Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:06.073614Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:06.074879Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:06.075452Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:06.078340Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:06.078735Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:06.078744Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.079891Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:06.085295Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:06.085910Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:06.089996Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:06.091265Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:06.091827Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:06.102707Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:06.116658Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:06.135622Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:06.135654Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.153350Z  INFO local_candidate{attempt=26}: compared ordinary and paired exchange schedules phase=22 candidates=18 ordinary_horizon=2545 paired_horizon=2330 use_paired=false
2026-09-12T18:14:06.162906Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:06.162933Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:06.163754Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:06.166165Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:06.166320Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:06.169932Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:06.170779Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:06.170796Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.178447Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:06.180783Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:06.180811Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:06.180971Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:06.185333Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:06.185356Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.190757Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:06.190782Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.192522Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:06.193653Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:06.194252Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:06.194270Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.196064Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:06.204635Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:06.205393Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:06.207194Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:06.207745Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:06.207763Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.209379Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:06.236104Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:06.236896Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:06.236906Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:06.236935Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.237789Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:06.237801Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.238813Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:06.239328Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:06.248439Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:06.248766Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:06.248775Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.249105Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:06.249428Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:06.249437Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.249889Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:06.250459Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:06.357031Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:06.357075Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:06.371997Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:06.372034Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:06.379127Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:06.389716Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:06.392413Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:06.397839Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:06.411634Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:06.411671Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.429229Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:06.431988Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:06.432016Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.478869Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:06.507732Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:06.508327Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:06.508339Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.509691Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:06.540776Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:06.568964Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:06.571361Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:06.571390Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.572230Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:06.572256Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.576171Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:06.605136Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:06.605172Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:06.606530Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:06.608533Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:06.613430Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:06.615062Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:06.636498Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:06.636540Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.639643Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:06.640766Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:06.640808Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.643152Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:06.651547Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:06.651628Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.668962Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:06.670801Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:06.700927Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:06.704624Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:06.715664Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:06.717646Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:06.717667Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.725196Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:06.725853Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:06.725862Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.727316Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:06.735611Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:06.752447Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:06.752476Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.758127Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:06.758158Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.765179Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:06.778002Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:06.786753Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:06.789198Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:06.789231Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.790496Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:06.791213Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:06.791951Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:06.815414Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:06.816172Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:06.816188Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.818298Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:06.839658Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:06.841910Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:06.841927Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.842647Z  INFO local_candidate{attempt=25}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:14:06.845115Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:06.882749Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:06.885162Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:06.885179Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.887762Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:14:06.887792Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:06.887806Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:06.901559Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:06.901596Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:06.902088Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:14:06.931650Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:06.973841Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:06.973875Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:06.979729Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:06.979766Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:06.985344Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:14:06.998919Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:07.023154Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:07.025172Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:07.034542Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:07.034576Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.038323Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:07.038351Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.046328Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:07.046358Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.046885Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:07.062707Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:07.070996Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:07.072926Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:07.073722Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:07.073745Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.077055Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:07.085877Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:07.085964Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.091477Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:07.091912Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:07.091922Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.093029Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:07.095870Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:07.098424Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:07.102907Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:07.127742Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:07.128700Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:07.128719Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.131713Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=27 success=true
2026-09-12T18:14:07.132255Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:07.134909Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:07.142228Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:07.150674Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:07.151325Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:07.151342Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.153083Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:07.154322Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:07.161581Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:07.168643Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:07.172290Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:07.172329Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:07.197256Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:07.197324Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:07.203022Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:07.204643Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:07.219697Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:07.236705Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:07.238707Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:07.238730Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.243461Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:07.244751Z  INFO local_candidate{attempt=26}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:14:07.250397Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:07.271717Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:07.271742Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.275071Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:07.276085Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:07.276099Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.278947Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:07.281103Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:14:07.281132Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:07.285326Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:07.291461Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:14:07.303986Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:07.328864Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:07.328904Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.346349Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:07.367884Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:07.367927Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:07.377387Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:07.377420Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:07.384783Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:07.394536Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:14:07.406716Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:07.406747Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:07.438976Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:07.443421Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:14:07.465863Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:07.465889Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.495801Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:07.514549Z  INFO local_candidate{attempt=37}: exchange table and repeat patch storage exchange_table_bytes=27960 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:07.526793Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:07.550892Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:14:07.550925Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:07.551401Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:07.551418Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.562106Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:14:07.581041Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:07.670278Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:07.672324Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:07.675796Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:07.675816Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.682273Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:07.712647Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:07.712682Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:07.717121Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:07.717151Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.743845Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:14:07.771585Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:07.810477Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:07.811461Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:07.811479Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.813875Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:07.837454Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:07.837541Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:07.869055Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:07.911189Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:07.913579Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:14:07.913615Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:07.914845Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:07.914866Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:07.919031Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:07.930506Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:14:08.002911Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:08.003000Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:08.032168Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:08.042993Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:08.043027Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:08.050740Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:08.090329Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:08.115304Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:08.115331Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:08.133750Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:08.144617Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:08.144696Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:08.170521Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:08.191629Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:08.191678Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:08.197775Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:08.199814Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:08.200232Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:08.200250Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:08.203212Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:08.345220Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:08.345259Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:08.356421Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:08.862651Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:08.907365Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:08.907405Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:08.955965Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:08.971378Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:09.002106Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:09.002141Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.045743Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:09.210157Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:09.253615Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:09.253654Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.290625Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:09.369232Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:09.417643Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:09.417738Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.456343Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:09.480777Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:09.480812Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:09.481889Z  INFO local_candidate{attempt=27}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:14:09.495070Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:09.530732Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:14:09.530765Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:09.545983Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:14:09.561015Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:09.577366Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:09.636152Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:09.645668Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:09.645702Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.661943Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:09.661965Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.667561Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:09.667595Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:09.679726Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:09.679763Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.684042Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:09.690667Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:09.692369Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:09.716620Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:09.759228Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:09.777134Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:09.777776Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:09.777794Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.780447Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:09.788795Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:09.788893Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.796569Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:09.797240Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:09.797291Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.798813Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:09.806296Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:09.819930Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:09.820478Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:09.820491Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.822920Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:09.849262Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:09.861726Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:09.917611Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:09.918605Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:09.918619Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:09.921336Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:09.958676Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:09.968628Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:09.968664Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:10.011586Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:10.011623Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:10.017434Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:14:10.018269Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:10.019284Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:10.019297Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:10.022004Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:10.110832Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:10.138350Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:10.138386Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:10.170332Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:10.170419Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:10.176663Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:14:10.205173Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:10.222195Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:10.283870Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:10.285663Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:10.285685Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:10.290218Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:10.402531Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:14:10.402567Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:10.419922Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:14:10.501931Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=887 success=true
2026-09-12T18:14:10.501973Z  INFO local_candidate{attempt=37}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27960 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:10.501986Z  INFO local_candidate{attempt=37}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27960 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:10.537864Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:10.537901Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:10.558691Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:10.756333Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:10.857703Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:10.857736Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:10.899361Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:10.990142Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:10.990177Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.025913Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:11.027082Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:11.077665Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:11.078682Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:11.078697Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.081375Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:11.081634Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5710 paired_horizon=11269 use_paired=false
2026-09-12T18:14:11.086126Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:11.086150Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.105654Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:11.143289Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:11.143317Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:11.155181Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:11.159928Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:11.173105Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:14:11.200984Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:11.201012Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.205827Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:11.207284Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:11.208381Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:11.208396Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.211176Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:11.222654Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:11.223184Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:11.223194Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.224801Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:11.236224Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:11.236652Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:11.236660Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.237772Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:11.243837Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:11.258693Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:11.259549Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:11.259562Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.261714Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:11.383029Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:11.449062Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:11.450916Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:11.450941Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.455831Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:11.491893Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=989 success=true
2026-09-12T18:14:11.516870Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:14:11.516909Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:11.520301Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:11.537284Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:11.566397Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:11.566436Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.611174Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:11.685217Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:14:11.690705Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:11.705684Z  INFO local_candidate{attempt=30}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:14:11.758682Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:11.760635Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:11.760667Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.764752Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:11.772931Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:11.772957Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:11.775687Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:11.781413Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:11.781431Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.788510Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:11.798054Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:11.799546Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:11.799572Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.800101Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:14:11.809175Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:14:11.809216Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:11.810284Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:14:11.817113Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:11.824576Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:11.833906Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:14:11.833938Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:11.838032Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:11.838061Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:11.838046Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:11.838477Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:11.838491Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.840038Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:11.850026Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:11.850406Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:11.850415Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.851473Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:11.854914Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:11.856527Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:11.860958Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:11.862167Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:11.862729Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:11.873356Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:11.911956Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:11.935199Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:11.939787Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:11.939810Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.940353Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:11.947452Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:11.954944Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:11.954969Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.954950Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:11.960159Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:11.960593Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:11.960603Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:11.961663Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:11.981291Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:14:11.997787Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:11.998235Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:11.998664Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:11.998675Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.000188Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:12.009754Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:12.010074Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:12.010081Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.011152Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:12.014954Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:12.016013Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:12.016028Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.018796Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:12.051604Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:12.051638Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.052895Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:12.053044Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:12.054345Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:12.054362Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.057974Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:12.085108Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:12.102825Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:12.102860Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.121968Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:12.133432Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:12.133453Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.136314Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:12.151480Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:12.189058Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:12.189092Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:12.200547Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:12.203280Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:12.204165Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:12.204191Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:12.207788Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:12.249872Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:12.249905Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.259516Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:12.267297Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:12.268358Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:12.268373Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.271168Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:12.284092Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:12.315151Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:12.328404Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:12.328427Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.338396Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:12.338826Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:12.338850Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:12.352416Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:12.365323Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:12.366448Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:12.366462Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.368472Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:12.431157Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:12.489891Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:12.489926Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:12.503831Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:12.532967Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:12.532999Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.548869Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:12.590949Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:12.599195Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:12.599227Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.606876Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:12.610530Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:12.637766Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:12.637796Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.638063Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:12.638094Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.681841Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:12.690323Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:12.700772Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:12.715376Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:12.715414Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.725987Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:12.752670Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:12.752724Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:12.753391Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:12.753407Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.753781Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:12.753794Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.755454Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:12.756582Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:12.757575Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:12.767021Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:12.767473Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:12.767483Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.768522Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:12.773728Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:12.778112Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:12.826028Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:12.851014Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:12.851049Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.863912Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:12.879124Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:12.880325Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:12.880339Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.883442Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:12.902399Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:12.902432Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.940418Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:12.964891Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:12.965440Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:12.965449Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:12.966856Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:13.002927Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:13.011266Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:13.021986Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:13.033790Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:13.033813Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.046395Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:13.046420Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.047441Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:13.049526Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:13.064654Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:13.064677Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:13.067135Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:14:13.076364Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:13.077375Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:13.077390Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.080186Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:13.080940Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:13.086696Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:13.086727Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.099531Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:13.101698Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:13.101714Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.105460Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:13.149815Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:13.175843Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:13.228185Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:13.228239Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.263659Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:13.281399Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:13.281435Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:13.300688Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:13.328878Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:13.334877Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:13.334899Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.342832Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:13.354340Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:13.360063Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:13.362396Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:13.363432Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:13.371698Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:13.386006Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:13.386452Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:13.386460Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.388105Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:13.402947Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:13.403583Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:13.403599Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.405252Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:13.414105Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:13.421939Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:13.424061Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:13.425112Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:13.441058Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:13.453291Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:13.473666Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:13.473688Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.479314Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:13.479347Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:13.487871Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:13.493485Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:13.511701Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:13.516587Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:13.516618Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.528971Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:13.547828Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:13.548362Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:13.548375Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.549661Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:13.578847Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:13.579799Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:13.579812Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.581393Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:13.591955Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:13.592366Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:13.592374Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.593593Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:13.603587Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:13.631839Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:13.631863Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.665677Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:13.683744Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:13.698167Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:13.699352Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:13.699367Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.701978Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:13.718044Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:13.718301Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:13.718334Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:13.718799Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:13.718815Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.720347Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:13.730640Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:13.730662Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.773151Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:13.774846Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:13.785030Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:13.788035Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:13.803943Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:13.811656Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:13.811678Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:13.843699Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:14.000673Z  INFO local_candidate{attempt=41}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5710 paired_horizon=11269 use_paired=false
2026-09-12T18:14:14.020121Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:14.029525Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:14.029564Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.031106Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:14.031138Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.043360Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:14.049929Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:14.068949Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:14.068987Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.071954Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:14.071982Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.099187Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:14.099232Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.099277Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:14:14.106323Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:14.112469Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:14.138269Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:14.146070Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:14.146104Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.170002Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:14.304664Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:14.304699Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.314822Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:14.318127Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:14.320784Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:14.328780Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:14.328808Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.334312Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:14.334330Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.336305Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:14.341374Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:14.347102Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:14.347131Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.358575Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:14.358597Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.358912Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:14.359661Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:14.363638Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:14.364550Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:14.364571Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.367074Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:14.379250Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:14.379837Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:14.379845Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.380980Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:14.385044Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:14.385064Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.386644Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:14.391540Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:14.393531Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:14.417796Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:14.428093Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:14.428127Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.440063Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:14.440599Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:14.440608Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.442050Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:14.443504Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:14.463883Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:14.488339Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:14.493941Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:14.494528Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:14.494537Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.495939Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:14.563161Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:14:14.563211Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.628095Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:14.628129Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.630514Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:14.659023Z  INFO local_candidate{attempt=28}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:14.684077Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:14.684122Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.687284Z  INFO local_candidate{attempt=28}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:14.687313Z  INFO local_candidate{attempt=28}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.701675Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:14.703652Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:14.719330Z  INFO local_candidate{attempt=28}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:14.740950Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:14:14.744746Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:14.744771Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.773745Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:14.773780Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.778664Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:14.783780Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:14.792130Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:14.798162Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:14.818350Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:14.819849Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:14.819865Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.822989Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:14.836697Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:14.836726Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:14.878535Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:14.960422Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:14.960462Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.981102Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:14.981135Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:14.994408Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:15.004899Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:15.012440Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:15.032181Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:15.035708Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:15.035743Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.035966Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:15.035994Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.053345Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:15.054999Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:15.079182Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:15.082379Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:15.082402Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.090359Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:15.090388Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:15.104315Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:15.117804Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:15.137265Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:15.167304Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:15.234418Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:15.234449Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.306429Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:15.306458Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:15.320551Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:15.330295Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:15.382914Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:15.383802Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:15.383818Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.385927Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:15.668722Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:15.690442Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:15.690467Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.704440Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:15.706246Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:15.750857Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:15.750894Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:15.766139Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:15.768405Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:15.768423Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.769005Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:15.769029Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.771480Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:15.777063Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:15.789862Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:15.798989Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:15.814424Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:15.814447Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.831000Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:15.831024Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.831064Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:15.838012Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:15.868619Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:15.879296Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:15.881253Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:15.883507Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:15.883522Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.886198Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:15.893000Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:15.893609Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:15.893619Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.894238Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:15.894682Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:15.894691Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.895136Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:15.896252Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:15.906585Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:15.906961Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:15.906969Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.908029Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:15.913299Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:15.927077Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:15.927629Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:15.927641Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:15.928001Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:15.928021Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:15.929624Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:15.935753Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:15.974632Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:15.997227Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:15.997252Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:15.999790Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:14:16.002901Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:16.002920Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:16.038189Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:16.111722Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:16.391521Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:16.412255Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:16.412281Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:16.413426Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:16.426960Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:16.437744Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:16.437772Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:16.448876Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:16.469325Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:16.473456Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:16.473478Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:16.490569Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:16.541384Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:16.543653Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:16.543669Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:16.546450Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:16.550082Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:16.562597Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:16.562630Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:16.574260Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:16.574289Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:16.611635Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:16.647862Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:16.651688Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:16.651723Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:16.654659Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:16.654689Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:16.733967Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:16.737024Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:16.874763Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:16.898121Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:16.898157Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:16.924074Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:16.924099Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:16.960577Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:16.977245Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:17.046800Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=40 success=true
2026-09-12T18:14:17.049990Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:17.056868Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:17.106332Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:17.106368Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:17.130224Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:14:17.168698Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:17.168746Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:17.181627Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:17.262681Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:17.287644Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:17.287682Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.289587Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:17.289617Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:17.297669Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:14:17.319087Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:17.409923Z  INFO local_candidate{attempt=31}: exchange table and repeat patch storage exchange_table_bytes=27948 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:17.448482Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:17.473166Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:17.473189Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.489975Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:17.497518Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:17.497556Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:17.543462Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:17.545735Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:17.545750Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.548502Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:17.575886Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:17.586302Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:17.599689Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:17.631556Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:17.631592Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.635617Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:17.635649Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.645695Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:17.668769Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:17.673777Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:17.673804Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.682253Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:17.689652Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:17.699692Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:17.699713Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.705059Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:17.705599Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:17.705610Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.706340Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:17.706951Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:17.728598Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:17.729154Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:17.729161Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.730565Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:17.732337Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:17.753197Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:17.754503Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:17.754991Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:17.754998Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.756446Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:17.762745Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=29 success=true
2026-09-12T18:14:17.765817Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:17.772709Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:17.811956Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:17.868335Z  INFO local_candidate{attempt=41}: compared ordinary and paired exchange schedules phase=34 candidates=6561 ordinary_horizon=7923 paired_horizon=6885 use_paired=false
2026-09-12T18:14:17.889083Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:17.894718Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:17.894741Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.902031Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:17.906305Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:17.906328Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:17.911861Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:17.916964Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:17.918809Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:17.919602Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:17.920800Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:14:17.927367Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:17.940534Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:17.940897Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:17.940904Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.942920Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:17.956737Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:17.957301Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:17.957320Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.959026Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:17.967025Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:17.973258Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:17.974481Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:17.975034Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:17.981805Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:17.983984Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:17.984001Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:17.985706Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:17.986596Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:18.052237Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:18.056393Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:18.056411Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.064245Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:18.077528Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:18.077946Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:18.077954Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.079193Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:18.105428Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:18.106178Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:18.106187Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.107663Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:18.117350Z  INFO local_candidate{attempt=38}: exchange table and repeat patch storage exchange_table_bytes=27960 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:18.117424Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:18.117773Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:18.117780Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.119019Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:18.248901Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:18.272625Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:18.272649Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.303902Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:18.339834Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:18.339877Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:18.377493Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:18.431268Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:18.433973Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:18.439570Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:18.439602Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.490101Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:18.494952Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:18.494989Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.499567Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:18.499596Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:18.507674Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:18.508802Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:18.518544Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:18.518567Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.553239Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:18.553307Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:18.565789Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:18.569017Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:18.569536Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:18.569548Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.571019Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:18.576964Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:18.577499Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:18.577507Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.578893Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:18.581951Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:18.582381Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:18.582390Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.583423Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:18.585331Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:18.589282Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:18.610096Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:18.610141Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.611709Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:18.612604Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:18.612617Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.614803Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:18.616747Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:18.617323Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:18.624566Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=42 success=true
2026-09-12T18:14:18.627695Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:18.631841Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:18.632287Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:18.632300Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.633874Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:18.637192Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:18.644297Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:18.644680Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:18.644688Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.645788Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:18.646295Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:18.646323Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.651199Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:18.671430Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:18.672136Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:18.672149Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.675285Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:18.681807Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:18.681837Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:18.682767Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:18.762175Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:18.785237Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:18.867486Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:18.867520Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:18.869935Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:14:18.885762Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:18.899435Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:18.899458Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.906954Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:18.929394Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:18.930037Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:18.930046Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.932567Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:18.944273Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:18.944697Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:18.944705Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:18.945180Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:18.945221Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:18.945815Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:18.951193Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:18.955696Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:18.971587Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:18.972229Z  INFO local_candidate{attempt=35}: exchange table and repeat patch storage exchange_table_bytes=27888 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:18.989013Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=31 success=true
2026-09-12T18:14:18.992155Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:18.999177Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:19.039683Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:19.061853Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:19.061887Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.073924Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:19.097895Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:19.097917Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.111150Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:19.113568Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:19.134876Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:19.134898Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.143665Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:19.150311Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:19.162580Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:19.164791Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:19.164807Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.167483Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:19.180298Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:19.199193Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:19.200739Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:19.200771Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.201410Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:19.201427Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.203918Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:19.234668Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:19.234705Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:19.280069Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:19.309978Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:19.319831Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:19.321287Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:19.334196Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:19.334638Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:19.334647Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.336176Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:19.339264Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:19.339282Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.344296Z  INFO local_candidate{attempt=28}: exchange table and repeat patch storage exchange_table_bytes=27948 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:19.346220Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:19.346600Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:19.346609Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.347644Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:19.352672Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:19.360877Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:19.360907Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:19.366043Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:19.366604Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:19.366615Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.368615Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:19.371898Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:19.394657Z  INFO local_candidate{attempt=25}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:19.395224Z  INFO local_candidate{attempt=25}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:19.395232Z  INFO local_candidate{attempt=25}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.396664Z  INFO local_candidate{attempt=25}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:19.428955Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=29 success=true
2026-09-12T18:14:19.431996Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:19.438661Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:19.439380Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:19.566565Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:19.593915Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:19.593939Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.626604Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:19.648867Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:19.649412Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:19.649426Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.650826Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:19.655329Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:19.693735Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:19.693771Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.711006Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:19.711041Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:19.726372Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:19.749014Z  INFO local_candidate{attempt=26}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:19.749537Z  INFO local_candidate{attempt=26}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:19.749545Z  INFO local_candidate{attempt=26}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.750908Z  INFO local_candidate{attempt=26}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:19.783489Z  INFO local_candidate{attempt=25}: exchange table and repeat patch storage exchange_table_bytes=27352 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:19.784034Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=30 success=true
2026-09-12T18:14:19.787156Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:19.797471Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:19.819795Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:19.820505Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:19.849130Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:19.849169Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.884617Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:19.887785Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:19.911779Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:19.911803Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:19.940122Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:19.941904Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:19.967035Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:19.967058Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.006960Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:20.029689Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:20.030226Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:20.030236Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.031568Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:20.078112Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:20.111997Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=773 success=true
2026-09-12T18:14:20.112038Z  INFO local_candidate{attempt=31}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=27948 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:14:20.112052Z  INFO local_candidate{attempt=31}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27948 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:20.148472Z  INFO local_candidate{attempt=26}: exchange table and repeat patch storage exchange_table_bytes=27352 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:20.176748Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:20.178642Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:20.231717Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:20.231741Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.243264Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:20.278688Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:20.278740Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.283585Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:20.299224Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:20.299257Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.308433Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:20.317688Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:20.333440Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:20.333470Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.342641Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:20.343168Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:20.343176Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.344551Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:20.349532Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:20.352828Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:20.364229Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:20.364683Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:20.364692Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.365404Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:20.365806Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:20.365813Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.366278Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:20.366321Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:20.367390Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:20.376939Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:20.377386Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:20.377396Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.377407Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:20.377769Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:20.377777Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.378835Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:20.378940Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:20.386509Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:20.387081Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:20.393330Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:20.395096Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:20.395862Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:20.405367Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:20.409165Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:20.409843Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:20.409857Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.411018Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:20.411795Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:20.413516Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:20.413782Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:20.413806Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.441761Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:20.441786Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.459539Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:20.466798Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:20.474301Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:20.496520Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:20.497037Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:20.497044Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.498382Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:20.503875Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:20.508249Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:20.508269Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.516876Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:20.533254Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:20.537185Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:20.537893Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:20.537908Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.539812Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:20.547282Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:20.547308Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:20.549919Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=27 tile=1452 row_words=15 horizon=3578
2026-09-12T18:14:20.559049Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:20.569347Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:20.570265Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:20.570285Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.571855Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:20.576069Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:20.581387Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:20.581703Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:20.581710Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.582058Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:20.582074Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.582862Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:20.588778Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:20.588803Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.589275Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:20.599603Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:20.604932Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:20.606966Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:20.607897Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:20.615661Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:20.629093Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:20.629515Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:20.629524Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.631485Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:20.632827Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:20.638594Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:20.638614Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.641985Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:20.642402Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:20.642410Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.643474Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:20.645820Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:20.648897Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:20.653743Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:20.653877Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:20.655070Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:20.655561Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:20.655713Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:20.665928Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:20.666319Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:14:20.666329Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.667173Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:14:20.672688Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:20.675280Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:20.686124Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:20.700066Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:20.701596Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:20.701992Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:20.702001Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.703568Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:20.714394Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:20.714509Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:20.714760Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:20.714770Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.714912Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:20.714921Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.715809Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:20.716381Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:20.720845Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:20.725505Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:20.726095Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:20.726468Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:20.726479Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.726759Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:20.727360Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:20.727355Z  INFO local_candidate{attempt=42}: compared ordinary and paired exchange schedules phase=56 candidates=36 ordinary_horizon=232 paired_horizon=1392 use_paired=false
2026-09-12T18:14:20.727425Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:20.732419Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:20.737953Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:20.739446Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:20.752321Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:20.753155Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:20.753171Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.756245Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:20.782575Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:20.782621Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.824679Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:20.825077Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:20.826648Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:20.829450Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:20.830281Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:20.830305Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.833652Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:20.833669Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.838347Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:20.842371Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:20.852378Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:20.852875Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:20.852883Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.854025Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:20.855510Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:20.855682Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:20.855699Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.855901Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:20.855910Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.856990Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:20.881732Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:20.882726Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:20.882738Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.883619Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:20.884270Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:20.884516Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:20.884526Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.886366Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:20.888966Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:20.894197Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:20.894570Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:20.894575Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.895623Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:20.895830Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:20.896141Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:20.896146Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.897176Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:20.911655Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:20.912175Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:20.912181Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:20.913654Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:20.919856Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=799 success=true
2026-09-12T18:14:20.919897Z  INFO local_candidate{attempt=38}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27960 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:20.919910Z  INFO local_candidate{attempt=38}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27960 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:20.970909Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:21.021022Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:21.021057Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:21.034230Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:21.086314Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:21.113345Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1001 success=true
2026-09-12T18:14:21.139180Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:21.139224Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.209941Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:21.371635Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:21.381733Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:21.385358Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:21.385381Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.387623Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:21.387643Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.393042Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:21.395037Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:21.405222Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:21.415312Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:21.415586Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:21.415955Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:21.416237Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:21.416248Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.416370Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:14:21.416381Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.417259Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:14:21.418835Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:21.422010Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:21.423698Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:21.430734Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:21.431169Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:21.431173Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:21.431177Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.432335Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:21.437627Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:21.439740Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:21.439761Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.442021Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:21.444469Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:21.444834Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:21.444845Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.446905Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:21.459047Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:21.462123Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:21.462746Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:21.462768Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.464471Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:21.472615Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:21.479407Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:21.481190Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:21.482032Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:21.498451Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:21.502880Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:21.515707Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:21.518009Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:21.518026Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.520725Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:21.566171Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:21.570435Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:21.570454Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.578148Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:21.598215Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:21.598257Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.598547Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:21.599167Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:21.599182Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.600748Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:21.629320Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:21.630523Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:21.630547Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.632691Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:21.643773Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:21.644096Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:21.644103Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.645227Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:21.655013Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:21.658051Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:21.668392Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:21.668415Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.671044Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:21.671062Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.674980Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:21.678005Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:21.691283Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:21.692187Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:21.692224Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:21.696055Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:21.696700Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:21.696713Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.699129Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:21.699710Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:21.700556Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:21.700569Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.702529Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:21.710107Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:21.710527Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:21.710537Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.711556Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:21.713754Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:21.714258Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:21.714268Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.715322Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:21.716573Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:21.720725Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:21.721735Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:21.725440Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=818 success=true
2026-09-12T18:14:21.725487Z  INFO local_candidate{attempt=35}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27888 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:21.725504Z  INFO local_candidate{attempt=35}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27888 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:21.727253Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:21.732890Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:21.739037Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:21.739071Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.765064Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:21.767516Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=43 success=true
2026-09-12T18:14:21.770598Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:21.775158Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:21.777492Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:21.780102Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:21.785449Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:21.805441Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:21.805483Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.807980Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:21.812005Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:21.813632Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:21.814317Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:21.814820Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:21.820453Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:21.828219Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:21.829891Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:21.830226Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:21.830236Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.831402Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:21.837788Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:21.837814Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:21.838610Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:21.838630Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.839401Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:21.839696Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:21.839704Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.840409Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:21.841522Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:14:21.844579Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:21.848134Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:21.849133Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:21.849652Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:21.857441Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:21.857956Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:21.858064Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:21.858086Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.858384Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:21.859510Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:21.867784Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:21.884518Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:21.884555Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.888555Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:21.889452Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:21.889474Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.889714Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:21.892219Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:21.919669Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:21.920562Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:21.920595Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.922130Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:21.925234Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:21.925248Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.930951Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:21.936518Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:21.939583Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:21.941053Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:21.941386Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:21.941396Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.942258Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:21.944235Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1024 success=true
2026-09-12T18:14:21.949841Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:21.949862Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.956758Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:21.957828Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=59 transfers=2047 maximum_identical_destinations=1
2026-09-12T18:14:21.957844Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=59 initial_horizon=174 selected_horizon=174 endpoint_lower_bound=64 lower_bound_gap=110 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:21.958960Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=59 tile=1112 row_words=38 horizon=174
2026-09-12T18:14:21.960096Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:21.962677Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:21.977300Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:21.977491Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:21.977513Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:21.977720Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:21.977730Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.979194Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:21.986533Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:21.987605Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:21.987618Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.989188Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:21.989521Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:21.989576Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:21.989584Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.990047Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:21.990586Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:21.991624Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:21.992400Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:21.992419Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:21.995130Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:21.995636Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:21.995924Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:22.001095Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:22.009009Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:22.009544Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:22.009554Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.009596Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:22.009983Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:22.009991Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.011260Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:22.011469Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:22.021185Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:22.021556Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:22.021567Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.022590Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:22.027650Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:22.045431Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:22.046407Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:22.046427Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.049654Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:22.055736Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:22.127917Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:22.127953Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:22.131986Z  INFO local_candidate{attempt=33}: exchange table and repeat patch storage exchange_table_bytes=27888 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:22.134336Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:22.151190Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:22.151774Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:22.151785Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.152963Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:22.158877Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:22.163660Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:22.172665Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:22.172687Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.176158Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:22.185278Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:22.185628Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:22.185635Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.186709Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:22.231414Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:22.232223Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:22.277995Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:22.286173Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:22.286194Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.289221Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:22.301932Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:22.312515Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:22.312536Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.345081Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:22.371770Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:22.382231Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:22.395266Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:22.395289Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.395954Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:22.395972Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.401744Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:22.412154Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:22.419032Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:22.422611Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:22.422660Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:22.423264Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:22.423277Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.425168Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:22.425188Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.425707Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:22.432613Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:22.443150Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:22.448439Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:22.450488Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:22.451401Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:22.458084Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:22.458109Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.459142Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:22.462407Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:22.464599Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:22.464614Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.467341Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:22.472824Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:22.473218Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:22.473226Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.475269Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:22.485923Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:22.486345Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:22.486365Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.487457Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:22.492855Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:22.497634Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:22.498930Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:22.499540Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:22.500682Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:22.503033Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:22.511107Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:22.533118Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:22.555391Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:22.555425Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.558089Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:22.558115Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.587314Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:22.587418Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:22.587903Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:22.590585Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:22.591935Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:22.591951Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.599929Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:22.600678Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:22.601111Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:22.601121Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.602756Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:22.613006Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:22.613410Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:22.613420Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.613965Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:22.614380Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:22.614424Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:22.614433Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.615579Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:22.619588Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:22.624262Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:22.625584Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:22.626224Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:22.635682Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:22.645655Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:22.646775Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:22.646805Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.648338Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:22.660912Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:22.661507Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:22.661522Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.663305Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:22.683065Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:22.688886Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:22.688912Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.691461Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:22.693309Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=967 success=true
2026-09-12T18:14:22.696150Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:22.702765Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:22.705757Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:22.710466Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:22.710485Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.717456Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:22.724688Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:22.724716Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.729639Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=27 success=true
2026-09-12T18:14:22.729921Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:22.730342Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:22.730353Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.731382Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:22.731912Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:22.731936Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.732658Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:14:22.738949Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:22.742338Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:22.755435Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:22.755455Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.756218Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:22.757016Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:22.757025Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.757391Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:22.758413Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:22.765612Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:22.767110Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:22.767461Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:22.767467Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.768430Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:22.769111Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:22.780540Z  INFO local_candidate{attempt=27}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:22.781093Z  INFO local_candidate{attempt=27}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:22.781100Z  INFO local_candidate{attempt=27}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.782627Z  INFO local_candidate{attempt=27}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:22.791958Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:22.793047Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:22.793062Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:22.795029Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:22.805641Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:22.805669Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:22.815161Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=29 success=true
2026-09-12T18:14:22.819462Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-12T18:14:22.821856Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:14:22.833655Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:22.913267Z  INFO local_candidate{attempt=45}: compared ordinary and paired exchange schedules phase=60 candidates=972 ordinary_horizon=528 paired_horizon=2983 use_paired=false
2026-09-12T18:14:22.933013Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=60 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:22.933036Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=60 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:22.939036Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=60 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:22.957851Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:22.957874Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:22.959638Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:22.975238Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:22.975281Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:22.976726Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:14:22.979348Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=803 success=true
2026-09-12T18:14:22.979432Z  INFO local_candidate{attempt=26}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10156 exchange_table_bytes=27352 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:22.979463Z  INFO local_candidate{attempt=26}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27352 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10156 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:22.994658Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=1601 success=true
2026-09-12T18:14:22.994695Z  INFO local_candidate{attempt=28}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=27948 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:14:22.994722Z  INFO local_candidate{attempt=28}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27948 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:23.051002Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:23.059819Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:23.059853Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.071450Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:23.123195Z  INFO local_candidate{attempt=29}: exchange table and repeat patch storage exchange_table_bytes=27856 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:23.197731Z  INFO local_candidate{attempt=27}: exchange table and repeat patch storage exchange_table_bytes=27352 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:23.262346Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:23.278430Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:23.294005Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:23.294035Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.304450Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:23.304476Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.327037Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:23.336305Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:23.349630Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:23.350138Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:23.350145Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.352183Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:23.367017Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:23.385277Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:23.394935Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:23.394980Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.408611Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:23.408656Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.427012Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:23.434343Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:23.466267Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:23.467439Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:23.467454Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.470124Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:23.485522Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:23.486219Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:23.486230Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.486462Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:23.487802Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:23.488314Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:23.488331Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.490438Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:23.499937Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:23.509482Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:23.510990Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:23.513126Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:23.513145Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.515417Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:23.515437Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.522561Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:23.523250Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:23.531813Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:23.532523Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:23.532680Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:23.536485Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:23.536511Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.537680Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:23.539527Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:23.542294Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:23.543432Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:23.543451Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.549032Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:23.553761Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:23.554063Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:23.555745Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:23.555772Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.558166Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:23.559129Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:23.569231Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:23.569682Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:23.569692Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.571642Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:23.578954Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:23.579866Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:23.579880Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.581818Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:23.582215Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:23.582612Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:23.582623Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.583768Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:23.588918Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:23.593307Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:23.593511Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:23.593863Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:23.593872Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.594724Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:23.594930Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:23.595299Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:23.600440Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:23.605076Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:23.605799Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:23.616810Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:23.619027Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:23.619041Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.621783Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:23.631645Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:23.635196Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:23.643581Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=61 candidates=972 ordinary_horizon=456 paired_horizon=2588 use_paired=false
2026-09-12T18:14:23.646049Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:23.646427Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:23.646439Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.647798Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:23.656543Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:23.656867Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:23.656875Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.657756Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:23.662230Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:23.664655Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:23.664676Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=61 initial_horizon=456 selected_horizon=456 endpoint_lower_bound=96 lower_bound_gap=360 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:23.665572Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:23.665589Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.666072Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:23.667152Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:23.667675Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:23.669181Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:23.671398Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=61 tile=951 row_words=81 horizon=456
2026-09-12T18:14:23.673094Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:23.673110Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.676160Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:23.679689Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:23.698371Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:23.699025Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:23.699042Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.700786Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:23.714561Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=62 transfers=2878 maximum_identical_destinations=1
2026-09-12T18:14:23.714591Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=62 initial_horizon=1641 selected_horizon=1641 endpoint_lower_bound=1536 lower_bound_gap=105 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:23.716026Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:23.718001Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:23.718150Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=62 tile=1221 row_words=20 horizon=1641
2026-09-12T18:14:23.728994Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:23.729807Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:23.729820Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.731483Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:23.733951Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=63 transfers=1408 maximum_identical_destinations=1
2026-09-12T18:14:23.733977Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=63 initial_horizon=768 selected_horizon=768 endpoint_lower_bound=704 lower_bound_gap=64 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:23.735193Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=63 tile=47 row_words=28 horizon=768
2026-09-12T18:14:23.740085Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:23.740394Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:23.740401Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.741228Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:23.741358Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:23.744760Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:23.744775Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.746700Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:23.750314Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:23.752418Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:23.752435Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.760491Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:23.760858Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:23.760866Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.761715Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:23.768614Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:23.779340Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:23.781996Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:23.782417Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:23.782428Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.783865Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:23.785641Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:23.786382Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:23.786394Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.787705Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:23.790183Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:23.794230Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:23.794455Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:23.794702Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:23.794716Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.794976Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:23.795254Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:23.795264Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.795781Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:23.796057Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:23.796692Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:23.798060Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:23.798081Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.800784Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:23.805230Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:23.806550Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:23.807514Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:23.807536Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.808755Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:23.809695Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:23.824122Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:23.829455Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:23.829476Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.842579Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:23.843406Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:23.844394Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:23.844459Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.847631Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:23.859101Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:23.863844Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:23.864581Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:23.864604Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.866898Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:23.882289Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:23.882793Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:23.882808Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.883476Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:23.884314Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:23.892259Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:23.899488Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:23.901309Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:23.902126Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:23.918188Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:23.971282Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:23.978145Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:23.978169Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:23.986330Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:24.000355Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:24.007864Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:24.010643Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:24.011824Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:24.017159Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:24.021574Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:24.021611Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.021914Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:24.029638Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:24.041115Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:24.041676Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:24.041691Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.043411Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:24.043842Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:24.043852Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.044550Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:24.044944Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:24.059885Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:24.060430Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:24.060443Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.062087Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:24.063510Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:24.063539Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:24.067514Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:24.068328Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:24.071163Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:24.072747Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:24.073027Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:24.073042Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.073230Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:24.073924Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:24.074110Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:24.074124Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.074470Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:24.075671Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:24.080063Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:24.085244Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:24.086030Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:24.086404Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:24.086415Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.087583Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:24.089895Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:24.094979Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:24.096869Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:24.097676Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:24.097786Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:24.097804Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.100119Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:24.112612Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:24.136367Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:24.136406Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.140585Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:24.167085Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:24.168163Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:24.172256Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:24.172273Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.175768Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:24.176957Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:24.176971Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.179553Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:24.180298Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:24.192994Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:24.193419Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:24.193428Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.194513Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:24.195914Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:24.196682Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:24.196692Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.198340Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:24.221019Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:24.221817Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:24.221833Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.223339Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:24.232682Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:24.232988Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:24.232993Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.234026Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:24.243270Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:24.254234Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:24.318402Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:24.372382Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:24.372416Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.377573Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:24.411642Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:24.411677Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.443565Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:24.447668Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:24.476770Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:24.487799Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:24.487823Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.493171Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:24.496288Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=29 success=true
2026-09-12T18:14:24.499288Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:14:24.505789Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:24.509082Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:24.509667Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:24.509679Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.511104Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:24.511386Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:24.520719Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:24.521082Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:24.521090Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.521923Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:24.527091Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:24.527126Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.528658Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:24.534773Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:24.537185Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:24.553994Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:24.554696Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:24.554725Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.557406Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:24.592298Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:24.599174Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:24.599697Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:24.599715Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.600921Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:24.606843Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:24.612854Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:24.626462Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:24.626944Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:24.626956Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.628174Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:24.635190Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:24.641163Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:24.768141Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:24.781888Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:24.815585Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:24.815627Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.832086Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:24.837430Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:24.837464Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.853293Z  INFO local_candidate{attempt=45}: exchange table and repeat patch storage exchange_table_bytes=27856 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:24.854476Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:24.859463Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:24.859483Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.875429Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:24.888887Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:24.888912Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.893337Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:24.896469Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:24.914816Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:24.918415Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:24.919047Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:24.919059Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.921630Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:24.924911Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:24.926057Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:24.926070Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.928557Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:24.945125Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:24.946372Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:24.946391Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.949098Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:24.970564Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:24.978695Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:24.979449Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:24.986595Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:24.987085Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:24.987097Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.988627Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:24.989920Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:24.990339Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:24.990353Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:24.991753Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:24.999026Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:24.999434Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:24.999445Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.000357Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:25.000584Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:25.000691Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:25.000700Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.001472Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:25.005729Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:25.007100Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:25.011539Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:25.013088Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:25.013855Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:25.014373Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:25.016753Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:25.016785Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:25.021683Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:25.021700Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.024940Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:25.027117Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:25.027138Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.027121Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:25.033554Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:25.053717Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:25.054337Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:25.054349Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.056695Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:25.078753Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:25.082915Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:25.082943Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.088942Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=28 success=true
2026-09-12T18:14:25.092367Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:25.093422Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-12T18:14:25.103647Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:25.108277Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:25.108735Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:25.108747Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.110012Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:25.133287Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:25.133950Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:25.133966Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.135242Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:25.143533Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:25.143822Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:25.143830Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.144749Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:25.178612Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:25.197460Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:25.197483Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.205025Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:25.210564Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:25.259158Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:25.262190Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:25.262270Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.266085Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:25.274214Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:25.274280Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.342137Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:25.342178Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:25.343684Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:25.369473Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:25.410402Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:25.410451Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.418299Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:25.419785Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:25.419852Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.419889Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:25.423554Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:25.434849Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:25.440405Z  INFO local_candidate{attempt=34}: exchange table and repeat patch storage exchange_table_bytes=27888 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:25.445612Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:25.464643Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:25.464675Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.482500Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:25.482535Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.485435Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:25.504126Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:25.522767Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:25.526556Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:25.540803Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:25.541223Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:25.541239Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.542747Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:25.552970Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:25.553373Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:25.553383Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.554526Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:25.559971Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:25.563154Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:25.573467Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:25.574007Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:25.574016Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.576473Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:25.605679Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:25.605719Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.668023Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:25.675265Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:25.679579Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:25.679598Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.685890Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:25.694901Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:25.699794Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:25.701661Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:25.701750Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:25.702676Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:25.729748Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:25.729794Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.764020Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:25.843035Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:25.852538Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:25.854331Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:25.854367Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.861160Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:25.861199Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.863001Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=2883 success=true
2026-09-12T18:14:25.863835Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:25.872162Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:25.885182Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:25.886943Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:25.887536Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:25.887548Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.889219Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:25.890185Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:25.892115Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:25.892963Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:25.899055Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:25.899444Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:25.899460Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.900389Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:25.904939Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:25.908971Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:25.915675Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:25.918024Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:25.924791Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:25.924817Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.930479Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:25.941774Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:25.941803Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:25.969960Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:25.970367Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:25.970396Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:26.030935Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:26.058768Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:14:26.078942Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:26.078977Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.116169Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=27 success=true
2026-09-12T18:14:26.121319Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=5 success=true
2026-09-12T18:14:26.128223Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:26.155706Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:26.176733Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:26.196625Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:26.202922Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:26.202943Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.210358Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:26.210749Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:26.210759Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.212166Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:26.221769Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:26.222118Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:26.222126Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.223012Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:26.227884Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=927 success=true
2026-09-12T18:14:26.227917Z  INFO local_candidate{attempt=27}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10156 exchange_table_bytes=27352 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:26.227931Z  INFO local_candidate{attempt=27}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27352 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10156 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:26.227997Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:26.229147Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:26.241672Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:26.242255Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:26.242268Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.244253Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:26.370448Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:26.379250Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:26.387777Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:26.389221Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:26.394379Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:26.394399Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.396468Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:26.396498Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.400288Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:26.412566Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:26.415608Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:26.415626Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.433028Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:26.433051Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.448464Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:26.473800Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:26.477115Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:26.477146Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.478266Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:26.479137Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:26.479156Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.480942Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:26.481723Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:26.499527Z  INFO local_candidate{attempt=39}: exchange table and repeat patch storage exchange_table_bytes=27896 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:26.508300Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:26.546307Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:26.546343Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:26.555779Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:26.574065Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:26.578378Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:26.579095Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:26.579110Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.581603Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:26.598103Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:26.598691Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:26.598705Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.600279Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:26.602689Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:26.602724Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:26.623896Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:26.694582Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:26.710180Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:26.710218Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.721128Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:26.750975Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:26.751009Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:26.751176Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:26.752437Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:26.752453Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:26.754997Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:26.759442Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:26.764793Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:26.764822Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:26.771827Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:26.966016Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:26.986974Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:26.987007Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.001541Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:27.014505Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:27.014550Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.028105Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:27.032595Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:27.047749Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:27.048191Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:27.048198Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.049321Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:27.096329Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:27.098331Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:27.098349Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.100358Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:27.175068Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:27.175119Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:27.200904Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:27.234603Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:27.234644Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.250521Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1022 success=true
2026-09-12T18:14:27.263789Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=30 tile=707 row_words=441 horizon=14541
2026-09-12T18:14:27.271786Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:27.434035Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:27.473494Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:27.473529Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.476224Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:27.494800Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:27.494825Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.505341Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:27.512542Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=2308 success=true
2026-09-12T18:14:27.512567Z  INFO local_candidate{attempt=29}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=27856 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:14:27.512581Z  INFO local_candidate{attempt=29}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27856 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:27.525468Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:27.599625Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=34 candidates=6561 ordinary_horizon=7923 paired_horizon=6885 use_paired=false
2026-09-12T18:14:27.636900Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:27.636930Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:27.650176Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:14:27.696757Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:27.699878Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:27.699907Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.704191Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:27.707871Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:27.717233Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:27.717300Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.728079Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:27.731826Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=827 success=true
2026-09-12T18:14:27.731863Z  INFO local_candidate{attempt=45}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10024 exchange_table_bytes=27856 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:27.731876Z  INFO local_candidate{attempt=45}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27856 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10024 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:27.738868Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:27.743952Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:27.745884Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:27.746725Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:27.750299Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:27.780266Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=32 success=true
2026-09-12T18:14:27.781406Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:27.781429Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.783316Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:27.790235Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:27.819429Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:27.824025Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:27.842039Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:27.842561Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:27.842570Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.843854Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:27.871163Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:27.871220Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.903486Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:27.908221Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:27.910618Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:27.910635Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.913275Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:27.939551Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:27.939590Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:27.958404Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:27.983499Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:27.998098Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:28.013402Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:28.013856Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:28.013865Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.015396Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:28.026285Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:28.026665Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:28.026673Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.027678Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:28.033014Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:28.046107Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:28.046739Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:28.046750Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.048722Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:28.112653Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:28.139326Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:28.139354Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.140040Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:28.146325Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:28.151305Z  INFO local_candidate{attempt=43}: exchange table and repeat patch storage exchange_table_bytes=27888 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:28.151739Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:28.151755Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.156591Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:28.156619Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.158575Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:28.167394Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:28.167651Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=813 success=true
2026-09-12T18:14:28.167684Z  INFO local_candidate{attempt=34}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27888 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:28.167698Z  INFO local_candidate{attempt=34}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27888 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:28.167877Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:28.172855Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:28.174658Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:28.174716Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:28.175510Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:28.184056Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:28.196514Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:28.197654Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:28.197668Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.198020Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:28.198389Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:28.198399Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.199721Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:28.200370Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:28.209627Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:28.211324Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:28.211356Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.213393Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:28.213941Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:28.213954Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.215648Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:28.215713Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:28.223340Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:28.229035Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:28.230827Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:28.231635Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:28.239185Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:28.239910Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:28.239926Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.241568Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:28.241971Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:28.286970Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:28.297111Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:28.304620Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:28.308662Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:28.308680Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.315485Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:28.324854Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:28.329134Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:28.329532Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:28.329542Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.330086Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:28.330686Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:28.348117Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:28.348139Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.352630Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:28.352651Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.355574Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:28.356283Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:28.356295Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.357653Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:28.360525Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:28.360891Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:28.381258Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:28.416374Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:28.416512Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.486978Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:28.496437Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:28.496460Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:28.500226Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:28.507873Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:28.545274Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1032 success=true
2026-09-12T18:14:28.658413Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=926 success=true
2026-09-12T18:14:28.837676Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:28.837719Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:28.841018Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:28.882619Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:28.918370Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:28.918412Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:28.945936Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:29.090988Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:29.091039Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:29.109648Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:29.112279Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:29.118278Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:29.123233Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:14:29.123256Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.130398Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:14:29.151090Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:29.151733Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:29.151748Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.154128Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:29.164899Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:29.165338Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:29.165360Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.166463Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:14:29.173360Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:29.180338Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:29.181726Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=7414 success=true
2026-09-12T18:14:29.181761Z  INFO local_candidate{attempt=25}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10156 exchange_table_bytes=27352 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:29.181777Z  INFO local_candidate{attempt=25}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27352 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10156 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:29.186522Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:29.186566Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.191551Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1023 success=true
2026-09-12T18:14:29.201063Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:29.219822Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:29.219858Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:29.252570Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:29.252611Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.253120Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:29.282741Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:29.282776Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:29.286344Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:29.287028Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:29.287044Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.289055Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:29.290757Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:29.291487Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:29.298528Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:29.310821Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:29.310844Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.320679Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=832 success=true
2026-09-12T18:14:29.320731Z  INFO local_candidate{attempt=39}: placing generated tile programs linked_end=383612 host_code_base=383616 host_code_bytes=8892 generated_code_bytes=10052 exchange_table_bytes=27896 executable_ranges=[(378884, 378888), (380620, 380624), (382636, 382640), (383612, 383616), (392576, 524288)]
2026-09-12T18:14:29.320745Z  INFO local_candidate{attempt=39}: allocated package support memory linked_end=383612 profile_bytes=0 exchange_table_bytes=27896 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10052 code_address=392576 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:29.333528Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:29.336880Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:29.378630Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:29.393764Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:29.394233Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:29.394248Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.395900Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:29.406251Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:29.406615Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:29.406623Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.407658Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:29.412891Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:29.426355Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:29.426910Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:29.426920Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.429074Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:29.464407Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:29.484727Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:29.484769Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.500104Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:29.536229Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:29.537516Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:29.537532Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.539971Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:29.552829Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:29.565997Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:29.566020Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.576085Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:29.594802Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:29.601819Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:29.602888Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:29.602901Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.604736Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:29.627506Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:29.627553Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.665982Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:29.699081Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:29.700326Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:29.700342Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.703053Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:29.719248Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:29.719974Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:29.719982Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.721710Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:29.759761Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:29.771252Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:29.787308Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:29.801956Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:29.805847Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:29.805878Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.811650Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:29.811670Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.824429Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:29.838124Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:29.846379Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:29.846399Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:29.850871Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:29.857985Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:29.980469Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:29.992935Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:29.998178Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:30.005998Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:30.006020Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.006386Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:30.006406Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.016226Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:30.020266Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:30.026304Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:30.026323Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.031672Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:30.033632Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:30.042521Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:30.043594Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:30.043618Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.043631Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:30.046634Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:30.059068Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:30.059896Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:14:30.059933Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.061334Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:14:30.068343Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:30.069608Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:30.069682Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:30.071336Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:30.106831Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:30.117389Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:30.189145Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:30.191141Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:30.194650Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:30.194670Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.200126Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:30.239456Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:30.239483Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.269521Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1087 success=true
2026-09-12T18:14:30.272950Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:30.278011Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:30.278737Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:30.285731Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:30.285751Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.296329Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:30.298697Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:30.331727Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:30.331763Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:30.346214Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1025 success=true
2026-09-12T18:14:30.346794Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:30.346812Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.362334Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:30.423832Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:30.427727Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:30.459176Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:30.459217Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.464608Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:30.476407Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:30.479017Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:30.479439Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:30.479451Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.480941Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:30.491023Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:30.491402Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:30.491412Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.491709Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:30.491741Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.492355Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:30.497301Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:30.497502Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:30.518658Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:30.519650Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:30.519672Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.519927Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:30.522873Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:30.530510Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:30.531022Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:30.531031Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.532411Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:30.590868Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:30.593144Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:30.593162Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.595693Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:30.734623Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:30.749463Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:30.749500Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.768669Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:30.837711Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:30.838132Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:30.872672Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:30.872719Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.917763Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:30.920579Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:30.945355Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:30.945385Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.968952Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:30.971043Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:30.971110Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.975539Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:30.987020Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:30.993498Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:30.994185Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:30.994195Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:30.995812Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:31.015788Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:31.018311Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:31.019282Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:31.019295Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.021682Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:31.036969Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:31.037654Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:31.037665Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.038823Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:31.039171Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:31.039719Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:31.039740Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.048132Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:31.053528Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:31.086716Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:31.104690Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:31.110273Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:31.124229Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:31.135640Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:31.154820Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:31.154863Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.177687Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:31.180287Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:31.181461Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:31.198647Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:31.198681Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.204364Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=885 success=true
2026-09-12T18:14:31.204402Z  INFO local_candidate{attempt=43}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27888 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:31.204415Z  INFO local_candidate{attempt=43}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27888 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:31.205902Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:31.216021Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:31.221230Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:31.221253Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.226217Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=7112 success=true
2026-09-12T18:14:31.226241Z  INFO local_candidate{attempt=33}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27888 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:31.226254Z  INFO local_candidate{attempt=33}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27888 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:31.233737Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:31.233773Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.248755Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:31.266921Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:31.266961Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.268275Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:31.269187Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:31.269233Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.270028Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:31.272113Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:31.272145Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.276193Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:31.283668Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:31.288498Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:31.288539Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:31.291662Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:31.321383Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:31.322486Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:31.322504Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.324411Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:31.324427Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:31.328234Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:31.328260Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.378564Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:31.400817Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:31.428103Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:31.430510Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:31.430578Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.435635Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:31.462397Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:31.463320Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:31.463572Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:31.463587Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.464748Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:31.464768Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.466570Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:31.467407Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:31.470031Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:31.471066Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:31.476968Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:31.476986Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.484217Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:31.493736Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:31.498635Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:31.500438Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:31.501233Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:31.508478Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:31.509864Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:31.523057Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:31.523440Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:31.523451Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.524157Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:31.524982Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:31.525091Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:31.525104Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.527565Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:31.535006Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:31.535388Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:31.535399Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.536244Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:31.536269Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.536487Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:31.541505Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:31.541784Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:31.545985Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:31.547191Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:31.547766Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:31.549463Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:31.549494Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:31.557490Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:31.557629Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:31.558233Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:31.562642Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:31.575944Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:31.585026Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:31.585063Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.602606Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:31.638855Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:31.640194Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:31.641938Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:31.641958Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.646079Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:31.646101Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:31.650326Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:31.650346Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.654447Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:31.654470Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.658342Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:31.674096Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:31.674142Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:31.674758Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:31.674780Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.676675Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:31.704611Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:31.705429Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:31.705445Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.706954Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:31.716727Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:31.717051Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:31.717058Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:31.718187Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:31.896663Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:31.968937Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:31.968968Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.019960Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:32.187452Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:32.216715Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:32.216758Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.233902Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:32.276701Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:32.284104Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:32.286396Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:32.286412Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.289183Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:32.327558Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1101 success=true
2026-09-12T18:14:32.415855Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:32.415902Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:32.437487Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1233 success=true
2026-09-12T18:14:32.483273Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:32.483653Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:32.493348Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:32.501058Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:32.501097Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.509786Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:32.525125Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:32.525170Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.533567Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:32.534553Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:32.534577Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.538241Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:32.554628Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:32.555328Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:32.555350Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.557176Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:32.564691Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:32.567553Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:32.569515Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:32.577442Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:32.581806Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:32.592174Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:32.592772Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:32.592795Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.595607Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:32.611344Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:32.611956Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:32.611974Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.613811Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:32.621860Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:32.628746Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:32.630082Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:32.630820Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:32.635374Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:32.635398Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.639261Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:32.646722Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:32.653192Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:32.665366Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:32.665397Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.680791Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:32.680994Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:32.681017Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.703255Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:32.716816Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:32.744444Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:32.746799Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:32.746817Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.749712Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:32.749749Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:32.749757Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:32.751006Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:32.751045Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.753719Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:32.755903Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:32.755927Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.765918Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:32.770959Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:32.772278Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:32.772314Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.775324Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:32.785175Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:32.785863Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:32.785885Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.787719Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:32.815534Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:32.816386Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:32.816401Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.817882Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:32.827122Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:32.827455Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:32.827467Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.828532Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:32.833184Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:32.841855Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:32.852849Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:32.856773Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:32.881159Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:32.881183Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.897782Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:32.910303Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:32.926770Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:32.926794Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.941966Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:32.952745Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:32.953855Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:32.953891Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:32.966102Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:32.966142Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:32.972600Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:32.977467Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:32.992735Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:33.000631Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:33.003535Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:33.004764Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:33.006720Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:33.006884Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:33.008048Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:33.008065Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.010625Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:33.015889Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:33.026469Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:33.026503Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.026978Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:33.027398Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:33.028192Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:33.028219Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.029768Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:33.036722Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:33.037340Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:33.037355Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.040292Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:33.052484Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:33.052507Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.057429Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:33.057998Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:33.058010Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.059791Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:33.068418Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:33.075682Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:33.076924Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:33.077579Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:33.078405Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:33.082331Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:33.087313Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:33.094537Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:33.133964Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:33.186686Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:33.187683Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:33.187700Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.191736Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:33.202915Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:33.209066Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:33.209094Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.220703Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:33.241621Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:33.242283Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:33.242299Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.244107Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:33.287367Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:33.288769Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:33.288790Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.291319Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:33.301804Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:33.306562Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:33.307077Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:33.307087Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.308800Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:33.315008Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:33.315325Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:33.315345Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.321442Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:33.325515Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:33.333987Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:33.334012Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.340979Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:33.341643Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:33.341660Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.343958Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:33.345149Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:33.345577Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:33.349556Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:33.352530Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:33.353613Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:33.353627Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.355570Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:33.360121Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:33.360681Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:33.360697Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.362333Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:33.370305Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:33.370331Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.370445Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:33.377592Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:33.379444Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:33.380249Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:33.386328Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:33.386351Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.386534Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:33.387794Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:33.387811Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.390184Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:33.395604Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:33.399548Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:33.421710Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:33.422055Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:33.422492Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:33.422519Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.424339Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:33.433117Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:33.435806Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:33.440174Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:33.460003Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:33.463104Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:33.463132Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.468758Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:33.496019Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:33.499611Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:33.501692Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:33.501716Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.511898Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:33.511925Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.512026Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:33.519254Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:33.530551Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:33.530708Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:33.530726Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.531115Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:33.531128Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.532825Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:33.536405Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:33.545901Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:33.554610Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:33.555235Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:33.555249Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.557167Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:33.567581Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:33.567989Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:33.567997Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.568971Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:33.571487Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:33.572661Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:33.573853Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:33.573871Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.574056Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:33.575052Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:33.575074Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:33.576188Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:33.578432Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:33.579500Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:33.579517Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.588233Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:33.588632Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:33.588638Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.589105Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:33.589640Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:33.589657Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.589908Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:33.590494Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:33.591318Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:33.626972Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:33.627008Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:33.628352Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:33.640112Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:33.643262Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:33.648892Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:33.659312Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:33.659332Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.669502Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:33.673531Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:33.743799Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:33.743834Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:33.757839Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:33.794108Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:33.794149Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.905701Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:33.922847Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:33.922881Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.930735Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:33.947396Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:33.952984Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:33.953858Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:33.953878Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:33.955562Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:33.956432Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:33.971851Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:33.971873Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.000530Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:34.007582Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:34.008640Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:34.008659Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.011797Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:34.120114Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:34.178628Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:34.178653Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:34.205428Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:34.311910Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:34.311951Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:34.346005Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:34.421055Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:34.432667Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:34.432694Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.439051Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:34.458139Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:34.458774Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:34.458787Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.460805Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:34.461132Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:34.477724Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:34.478403Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:34.478426Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.479801Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:34.485254Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:34.491551Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:34.498424Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:34.514912Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:34.514960Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.519586Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:34.520427Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:34.520444Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.523250Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:34.566191Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:34.578061Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:34.578086Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.590307Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:34.595999Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:34.609765Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:34.631596Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:34.637060Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:34.637090Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.646944Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:34.647412Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:34.647425Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.648975Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:34.659472Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:34.659860Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:34.659869Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.660846Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:34.666072Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:34.673493Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:34.679610Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:34.680194Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:34.680219Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.682347Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:34.710106Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:34.712409Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:34.712437Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.717140Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:34.736810Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:34.737656Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:34.737669Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.739396Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:34.760644Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:34.788051Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:34.797332Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:34.797373Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.803630Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:34.822880Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:34.844725Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:34.849358Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:34.851307Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:34.851335Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.869191Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:34.869294Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.885784Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:34.889575Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:34.896724Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:34.897927Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:34.897944Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.900832Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:34.908710Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:34.911854Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:34.912440Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:34.912450Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.913733Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:34.919660Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:34.920414Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:34.920426Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.922468Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:34.931161Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:34.933323Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:34.933339Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.935843Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:34.951684Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=34 success=true
2026-09-12T18:14:34.954853Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:34.960078Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:34.960107Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:34.964514Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:34.974241Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:34.986079Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:35.039225Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:35.080604Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:35.095310Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:35.095777Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:35.095787Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.097365Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:35.107783Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:35.108174Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:35.108182Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.109135Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:35.119992Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:35.120503Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:35.120522Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.121768Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:35.168133Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:35.338100Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:35.346179Z  INFO local_candidate{attempt=40}: exchange table and repeat patch storage exchange_table_bytes=27964 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:14:35.378272Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:35.393495Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:35.393548Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.400716Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:35.441095Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:35.451408Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:35.451439Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.454320Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:35.454349Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.521640Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:35.545647Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:35.554196Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:35.562299Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:35.575771Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:35.575800Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.576906Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:35.577353Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:35.577365Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.578873Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:35.589279Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:35.589677Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:35.589685Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.590743Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:35.591158Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:35.591516Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:35.592063Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:35.592074Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.594530Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:35.597566Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:35.613190Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:35.618893Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:35.619503Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:35.619515Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.621541Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:35.637569Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:35.637596Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.659574Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:35.663049Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:35.663084Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:35.675980Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:35.676322Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:35.690770Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:35.690795Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.727892Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:35.740753Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:35.750894Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:35.751421Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:35.751429Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.752730Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:35.805092Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:35.807447Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:35.807468Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:35.810064Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:35.997673Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:36.041077Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:36.041105Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.076515Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:36.145524Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:36.166931Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:36.198042Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:36.199104Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:36.199127Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.218156Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:36.218182Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.231386Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:36.241446Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:36.241477Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:36.241503Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.276085Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:36.276128Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:36.289587Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:36.407171Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:36.407989Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:36.411763Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:36.412781Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:36.412798Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.419850Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:36.422235Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:36.429135Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:36.433845Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:36.435635Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:36.436409Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:36.441842Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:36.446300Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:36.446321Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.447722Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:36.447743Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.460956Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:36.461528Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:36.462526Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:36.462540Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.465126Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:36.474003Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:36.478394Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:36.485822Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:36.486221Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:36.486229Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.487949Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:36.492973Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:36.497636Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:36.497983Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:36.497999Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.498870Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:36.504007Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:36.505641Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:36.505662Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.508580Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:36.509793Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:36.510278Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:36.510376Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:36.512537Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:36.512553Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.515249Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:36.519872Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:36.588335Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:36.592074Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:36.592095Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.599649Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:36.613033Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:36.613493Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:36.613504Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.614714Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:36.615760Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:36.641156Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:36.641952Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:36.641964Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.643397Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:36.652304Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:36.652613Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:36.652619Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.653567Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:36.660874Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:36.661737Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:36.661751Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.663330Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:36.663806Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:36.669581Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:36.669607Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.677419Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:36.687727Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:36.693088Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:36.695154Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:36.696034Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:36.815348Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:36.840425Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:36.840461Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:36.874620Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:37.011893Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:37.017690Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:37.022704Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:37.022727Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.027932Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:37.033313Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:37.033339Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.047994Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:37.097805Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:37.100057Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:37.100072Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.102800Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:37.199864Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:37.240746Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:37.265556Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:37.265581Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.271511Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:37.290153Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:37.296490Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:37.310575Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:37.310599Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.315907Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:37.315931Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.321789Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:37.321818Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:37.326936Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:37.339578Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:37.339601Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.341932Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:37.346528Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:37.357364Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:37.368212Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:37.369013Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:37.369032Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.372688Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:37.372988Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:37.390080Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:37.390617Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:37.390631Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.391774Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:37.399525Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:37.406518Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:37.413378Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:37.458370Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:37.461170Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:37.461191Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.508470Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:37.513495Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:37.513518Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.519420Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:37.524981Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:37.527032Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:37.531557Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:37.531586Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.539214Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:37.550321Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:37.558033Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:37.560851Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:37.562043Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:37.565382Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:37.571774Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:37.583000Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:37.583699Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:37.583720Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.586054Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:37.591827Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:37.592432Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:37.592450Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.594990Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:37.601000Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:37.601419Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:37.601431Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.602382Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:37.607607Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:37.607615Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:37.608001Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:37.608012Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.609082Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:37.609786Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:37.609817Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:37.614350Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:37.619465Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:37.620802Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:37.620940Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:37.621338Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:37.621350Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.621645Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:37.623373Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:37.635123Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:37.693723Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:14:37.703003Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:37.707269Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:37.707292Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.714450Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:37.715193Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:37.715218Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:37.728334Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:37.728758Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:37.728766Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.729879Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:37.735371Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:37.735392Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.740771Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:37.740792Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.750733Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:37.756059Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:37.756861Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:37.756871Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.758655Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:37.766054Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:37.768169Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:37.768513Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:37.768520Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.769609Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:37.770007Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:37.792411Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:37.792448Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.809044Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:37.811566Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:37.811597Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:37.814779Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:37.829330Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:37.878394Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=14883 success=true
2026-09-12T18:14:38.131152Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:38.131190Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:38.212530Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=860 success=true
2026-09-12T18:14:38.212582Z  INFO local_candidate{attempt=40}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10096 exchange_table_bytes=27964 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:38.212598Z  INFO local_candidate{attempt=40}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27964 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10096 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:38.220935Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:14:38.414081Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:38.429514Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:38.429553Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=456 selected_horizon=456 endpoint_lower_bound=96 lower_bound_gap=360 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:38.439359Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=951 row_words=81 horizon=456
2026-09-12T18:14:38.474286Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:38.481253Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:38.482617Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=2878 maximum_identical_destinations=1
2026-09-12T18:14:38.482634Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1641 selected_horizon=1641 endpoint_lower_bound=1536 lower_bound_gap=105 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:38.485781Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1221 row_words=20 horizon=1641
2026-09-12T18:14:38.497532Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:38.497557Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:38.497979Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:38.498441Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1408 maximum_identical_destinations=1
2026-09-12T18:14:38.498452Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=768 selected_horizon=768 endpoint_lower_bound=704 lower_bound_gap=64 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:38.499491Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=28 horizon=768
2026-09-12T18:14:38.505013Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:38.509438Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:38.513857Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:38.527996Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:38.528512Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:38.529069Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:38.529078Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:38.531122Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:38.623068Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:38.711261Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:38.738097Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:38.738136Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:38.752678Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:38.752716Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:38.758062Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:38.801497Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:38.806975Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:38.809277Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:38.809296Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:38.811976Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:38.833524Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:38.850255Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:38.850280Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:38.865118Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:38.918304Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:38.920118Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:38.920148Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:38.922907Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:39.076949Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:39.138901Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:39.144228Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:39.173407Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:39.173442Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.182924Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:39.192046Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:39.192066Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.199052Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:39.199120Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=986 success=true
2026-09-12T18:14:39.203316Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:39.204194Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:39.204233Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.206167Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:39.207030Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:39.207065Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:39.223988Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:39.252503Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:39.252529Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.260168Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:39.260193Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.270511Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:39.270742Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:39.292014Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:39.310320Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:39.320090Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:39.320693Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:39.320703Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.322288Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:39.325397Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:39.340914Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:39.341392Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:39.341406Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.342929Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:39.347673Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:39.347703Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.353347Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:39.353725Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:39.353734Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.354730Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:39.359793Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:39.370600Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:39.372972Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:39.373535Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:39.373548Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.375613Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:39.376735Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:39.405449Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:39.488907Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:39.512303Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:39.512325Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.542006Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:39.547419Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:39.571764Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:39.577328Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:39.577349Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.584331Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:39.592228Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:39.594398Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:39.599373Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:39.601268Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:39.602067Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:39.609602Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:39.617949Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:39.618016Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.627776Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:39.628377Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:39.628403Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.631321Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:39.643461Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:39.643833Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:39.643843Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.644852Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:39.650012Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:39.651542Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:39.651573Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:39.652538Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:39.654480Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:39.655683Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:39.656247Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:39.666386Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:39.671603Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:39.671635Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:39.720952Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:39.728526Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:39.729052Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:39.731556Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:14:39.733120Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:39.733137Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.740601Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:39.753928Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:39.754405Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:39.754415Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.755670Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:39.770934Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:39.771587Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2047 maximum_identical_destinations=1
2026-09-12T18:14:39.771599Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=174 selected_horizon=174 endpoint_lower_bound=64 lower_bound_gap=110 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.773569Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1112 row_words=38 horizon=174
2026-09-12T18:14:39.783275Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:39.783312Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.875370Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:39.916845Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:39.931611Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:39.932032Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:39.932042Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.933916Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:39.949604Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:39.950193Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:39.950224Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:39.951785Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:40.028461Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:40.041707Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:40.041739Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.052045Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:40.079400Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:40.080494Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:40.080512Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.082387Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:40.114539Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:40.142597Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:40.151129Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:40.151167Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.182423Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:40.190889Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:40.190929Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.250704Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:40.274355Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:40.308787Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:40.308826Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.342645Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:40.347132Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:40.356017Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:40.356038Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:40.356056Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.368572Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:40.375031Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:40.382298Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:40.382330Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:40.390854Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:40.391899Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:40.391915Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.394432Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:40.410546Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:40.411221Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:40.411232Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.412806Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:40.422970Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:40.422991Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.426216Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:40.426242Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.456174Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:40.459869Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:40.464174Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:40.464221Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.466944Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:14:40.470218Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:40.475023Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:40.475984Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:40.489582Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:40.494035Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:40.497237Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:40.500099Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:40.501288Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:40.510961Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:40.511933Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:40.524402Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:40.524432Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.525130Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:40.525496Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:40.525508Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.527056Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:40.531259Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:40.531298Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:40.537066Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:40.537449Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:40.537458Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.538550Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:40.539968Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:40.543563Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:40.547754Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:40.548925Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:40.549483Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:40.549512Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.549492Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:40.552234Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:40.552858Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:40.552868Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.554734Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:40.555148Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:40.555157Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.555162Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:40.556610Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:40.559511Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:40.566225Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:40.566641Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:40.566648Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.567492Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:40.567727Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:14:40.567868Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:40.567883Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.568845Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:40.572948Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:40.573834Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:40.577425Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:40.578239Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:40.579127Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:40.579139Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.581488Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:40.586721Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:40.587264Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:40.587276Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.589233Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:40.622253Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:40.622536Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:40.626265Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:40.626281Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.633514Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:40.642096Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:40.644842Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:40.645446Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:40.645818Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:40.645825Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.646886Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:40.671746Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:40.672482Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:40.672493Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.672670Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:40.672688Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.673873Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:40.682430Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:40.682711Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:40.682716Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.683670Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:40.713336Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:40.715346Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:40.736068Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:40.745418Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:40.746081Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:40.746095Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.748065Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:40.756482Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:40.762993Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:40.763027Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.775699Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:40.776508Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:40.776532Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.779269Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:40.780005Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:40.831578Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:40.832577Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:40.832607Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:40.833832Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:40.833848Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:40.836589Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:40.878439Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:40.880998Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:40.945174Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:40.945217Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:40.971145Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:41.005480Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:41.041342Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:41.041365Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.088032Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:41.201427Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:41.219877Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:41.225988Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:41.226013Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.254868Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:41.255248Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:41.261164Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:41.261189Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.268694Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:41.278907Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:41.280366Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:41.283946Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:41.285806Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:41.286616Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:41.291699Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:41.291717Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.294326Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:41.310345Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:41.311038Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:41.311059Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.313666Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:41.314407Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:41.330093Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:41.330525Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:41.330536Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.331599Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:41.336890Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:41.341458Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:41.342679Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:41.343256Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:41.349913Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:41.349942Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:41.354106Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:41.360392Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:41.372832Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:41.372853Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.378962Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:41.391557Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:41.396417Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:41.398724Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:41.399334Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:41.399346Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.401441Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:41.412016Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:41.412417Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:41.412435Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.413502Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:41.418490Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:41.419507Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:41.419703Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:41.422031Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:41.422058Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.422739Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:41.423949Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:41.423965Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.431544Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:41.439330Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:41.444110Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:41.444503Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:41.444514Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.445678Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:41.455819Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:41.461303Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:41.461939Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2047 maximum_identical_destinations=1
2026-09-12T18:14:41.461950Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=174 selected_horizon=174 endpoint_lower_bound=64 lower_bound_gap=110 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.463458Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1112 row_words=38 horizon=174
2026-09-12T18:14:41.468816Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:41.472238Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:41.472258Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.477625Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:41.477649Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.508160Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=39 success=true
2026-09-12T18:14:41.511400Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:41.517568Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:41.518766Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:41.524623Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:41.529295Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:41.537702Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:41.537730Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:41.546631Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:41.548853Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:41.548872Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.565444Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:41.580601Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:41.586870Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:41.589550Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:14:41.589570Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.593352Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:41.594453Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:14:41.606573Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:41.612428Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:41.612871Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:41.612881Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.614387Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:41.624446Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:41.624820Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:41.624833Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.625836Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:41.630958Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:41.636786Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:41.636820Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:41.644115Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:41.644639Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:41.644649Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.646506Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:41.681830Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:41.692029Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:41.697881Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:41.739094Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:41.746019Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:41.774972Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:41.775008Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.798670Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:41.803687Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:41.805533Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:41.805557Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.818660Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:41.818680Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.832185Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:14:41.854390Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:41.864320Z  INFO local_candidate{attempt=42}: exchange table and repeat patch storage exchange_table_bytes=27920 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:41.891182Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:41.893427Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:41.893447Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.895995Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:41.909543Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:41.930831Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:41.930863Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.935046Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:41.947289Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:41.947311Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.955686Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:41.956596Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:41.956615Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:41.958673Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:41.965453Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:41.983520Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:42.014218Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:42.018659Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:42.044722Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:42.044764Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.046135Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:42.046172Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.074669Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:42.085406Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:42.171029Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:42.180368Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:42.188234Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:42.204715Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:42.204759Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.215078Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:42.219019Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:42.224066Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:42.224087Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.226233Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:42.226262Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.229020Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:14:42.236865Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:42.237534Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:42.237553Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.240076Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:42.244809Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:42.244837Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.251992Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:42.252457Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:42.252469Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.253552Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:14:42.259152Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:42.263849Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:42.265407Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=43377 success=true
2026-09-12T18:14:42.271928Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:42.326451Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:42.340195Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:42.361944Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:42.361979Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.390048Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:42.390904Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:42.390920Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.392922Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:42.398598Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:42.420633Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:42.421127Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:42.421134Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.422364Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:42.435681Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:42.441014Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:42.441032Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.447889Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:42.457100Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:42.461892Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:42.463740Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:42.464541Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:42.471880Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:42.473333Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:42.475662Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:42.475677Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.478161Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:42.484566Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:42.484923Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:42.484930Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.486886Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:42.496463Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:42.496808Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:42.496815Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.497788Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:42.502893Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:42.513171Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:42.514905Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:42.515666Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:42.530279Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:42.563458Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:42.585507Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:42.585529Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.594330Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:42.598559Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:42.598578Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.606059Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:42.614346Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:42.618963Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:42.619377Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:42.619386Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.620476Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:42.646071Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:42.646845Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:42.646856Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.648283Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:42.657284Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:42.657591Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:42.657598Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.658603Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:42.658781Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:42.736410Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:42.736453Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.841051Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:42.846895Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:42.855340Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:42.880186Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:42.880275Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.883392Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:42.883471Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.895390Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:42.898129Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:42.899004Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:42.899018Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:42.901056Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:42.927851Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:42.994300Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:43.023746Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:43.023769Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.070114Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:43.090761Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:43.094941Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:43.095487Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:43.095497Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.096288Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:43.096307Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.097049Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:43.103303Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:43.106679Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:43.112798Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:43.117467Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:43.119322Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:43.120101Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:43.148982Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:43.151351Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:43.151367Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.154016Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:43.173390Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:43.173417Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.221850Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:43.224486Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:43.347948Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:43.347984Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:43.350015Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:43.358752Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:43.362922Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:43.362944Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.369823Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:43.390408Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:43.391012Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:43.391029Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.393275Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:43.395023Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:43.395650Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:43.395669Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.404043Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:43.404458Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:43.404469Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.405488Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:43.410537Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:43.414870Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:43.441857Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:43.484879Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:43.518763Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:43.518811Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:43.532364Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:43.546255Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:43.549122Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:43.549153Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.550807Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:43.552276Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:43.552293Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.565222Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:43.612975Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:43.613183Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:43.613229Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.618639Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:43.618664Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.619294Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:43.625765Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:43.636004Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:43.640980Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:43.642830Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:43.643628Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:43.650840Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:14:43.651147Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:43.660082Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:43.664020Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:43.664392Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:43.664401Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.666033Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:43.674562Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:43.674976Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:43.674985Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.676566Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:43.677054Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:43.677443Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:43.677455Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.678491Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:43.682306Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:43.682326Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.683523Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:43.687021Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:43.687416Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:43.687426Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.687905Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:43.688485Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:43.689086Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:43.689653Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:43.691909Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:43.691938Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:43.699604Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:43.700219Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:43.703123Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:43.707124Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:43.710910Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:14:43.729900Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:43.734866Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:43.735903Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:43.735935Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.759833Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:43.759859Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.761285Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:43.777229Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:43.780241Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:43.784548Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:43.784566Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.789529Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:43.792616Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:43.796349Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:43.796376Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.805609Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:43.805999Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:43.806008Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.807090Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:43.832561Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:43.833295Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:43.833308Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.835056Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:43.843992Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:43.844307Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:43.844316Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.845351Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:43.888383Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:43.896967Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:43.896993Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:43.940007Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:43.941455Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:43.941483Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.944746Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:43.949797Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:43.955007Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:43.955026Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:43.957033Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:43.960957Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:44.030441Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:44.031189Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:44.031226Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:44.042271Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:44.042296Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.056506Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:44.058321Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:44.194337Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:44.194381Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:44.199437Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:44.199465Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:44.206091Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:44.211850Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:44.211882Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:44.222115Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:44.239294Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:44.241484Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:44.241560Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:44.289329Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:44.289365Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.292648Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:44.312981Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:44.313029Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.331447Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:44.331481Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.358479Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:44.370254Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:44.395427Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:44.395462Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.404431Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:44.404467Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:44.411974Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:44.412307Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:44.426300Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:44.433654Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:44.435428Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:44.457937Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:44.459381Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:44.459402Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.462597Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:44.491838Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:44.491872Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.557293Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:44.595991Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:44.597281Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:44.602878Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:44.602899Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.609731Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:44.610397Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:44.610836Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:44.610845Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.612423Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:44.622595Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:44.622963Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:44.622971Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.624017Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:44.631947Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:44.639175Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:44.642341Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:44.652772Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:44.653382Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:44.653396Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.655547Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:44.658144Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:44.658168Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.664946Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:44.685935Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:44.686572Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:44.686584Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.689006Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:44.700076Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:44.700504Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:44.700519Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.701603Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:44.701813Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=839 success=true
2026-09-12T18:14:44.701841Z  INFO local_candidate{attempt=42}: placing generated tile programs linked_end=383612 host_code_base=383616 host_code_bytes=8892 generated_code_bytes=10036 exchange_table_bytes=27920 executable_ranges=[(378884, 378888), (380620, 380624), (382636, 382640), (383612, 383616), (392576, 524288)]
2026-09-12T18:14:44.701853Z  INFO local_candidate{attempt=42}: allocated package support memory linked_end=383612 profile_bytes=0 exchange_table_bytes=27920 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10036 code_address=392576 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:44.706732Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:44.711038Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:44.718906Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:44.718932Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.746870Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=34 success=true
2026-09-12T18:14:44.749940Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:44.756574Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:44.839878Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:44.884867Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:44.885742Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:44.885756Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:44.887741Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:45.042679Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:45.071767Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:45.071800Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:45.106931Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:45.122945Z  INFO local_candidate{attempt=32}: exchange table and repeat patch storage exchange_table_bytes=27888 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:45.128826Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:45.129316Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:45.129325Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:45.130634Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:45.190032Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:45.192198Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:45.192227Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:45.194613Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:14:45.373390Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:45.373426Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:45.407619Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:45.458243Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:45.499383Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:45.499419Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:45.538158Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:45.555056Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=24441 success=true
2026-09-12T18:14:45.557073Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:45.577056Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:45.577082Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:45.589265Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:45.591940Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:45.671523Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:45.671566Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:45.690585Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=988 success=true
2026-09-12T18:14:45.787163Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:45.858655Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:45.941258Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:45.941295Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.032994Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:46.189622Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:46.225403Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:46.249682Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:46.249707Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.257224Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:46.257249Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.283669Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:46.306605Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:46.330075Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:46.331113Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:46.331734Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:46.367253Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:46.367279Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.372692Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:46.372714Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.377870Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:46.377901Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.405805Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:46.412338Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:46.443064Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:46.448040Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:46.448063Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.453032Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:46.488833Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:46.502792Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:46.502823Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.502827Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:46.513185Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:46.548171Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:46.549403Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:46.549721Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:46.549737Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.550278Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:46.550293Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.552382Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:46.552786Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:46.567184Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:46.578804Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:46.584363Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:46.584384Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.591312Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:46.599966Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:46.599998Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:46.601559Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:46.606580Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:46.608493Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:46.609315Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:46.613247Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:46.616494Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:46.628572Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:46.628596Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.629220Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:46.629576Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:46.629584Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.631518Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:46.645257Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:46.645842Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:46.645865Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.646571Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:46.647646Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:46.655399Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:46.661715Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:46.662943Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:46.663532Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:46.674106Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:46.688970Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:46.688997Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.727954Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:46.734673Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:46.735153Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:46.738964Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:46.738986Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.746394Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:46.759379Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:46.759797Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:46.759810Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.760883Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:46.786416Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:46.787230Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:46.787249Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.788739Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:46.790288Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:46.797763Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:46.798064Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:46.798071Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.798586Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:46.798603Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:46.799098Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:46.809862Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:46.918332Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:46.985400Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:46.986350Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:46.986379Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:47.062218Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:47.062256Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:47.088588Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:47.117011Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:47.133507Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:47.134422Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:47.134436Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:47.136804Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:47.514473Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:47.526848Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:47.526874Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:47.533357Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:47.537062Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:47.552890Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:47.553509Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:47.553522Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:47.555599Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:47.572908Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:47.573609Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:47.573632Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:47.575337Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:47.582642Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:47.587158Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:47.613190Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:47.613247Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:47.616864Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=28 success=true
2026-09-12T18:14:47.620071Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:14:47.627009Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:47.733343Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:47.787669Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:47.793396Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:47.829676Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:47.829714Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:47.847615Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:47.847656Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:47.872728Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:47.879050Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:47.894300Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=851 success=true
2026-09-12T18:14:47.894347Z  INFO local_candidate{attempt=32}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27888 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:47.894363Z  INFO local_candidate{attempt=32}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27888 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:47.904331Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:47.905411Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:47.905424Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:47.907936Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:47.923264Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:47.923948Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:47.923956Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:47.925580Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:47.931696Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:47.969622Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:47.969743Z  INFO local_candidate{attempt=41}: exchange table and repeat patch storage exchange_table_bytes=27964 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:14:47.979321Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:48.026450Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:48.026479Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:48.190302Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:48.213199Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:48.224294Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:48.224317Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:48.246922Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:48.256608Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:48.257656Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:48.257670Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:48.260160Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:48.289105Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:48.358131Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:48.358174Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:48.410026Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:48.414448Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:48.455430Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:48.492708Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:48.492735Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:48.520045Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:48.520072Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:48.577883Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:48.581246Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:48.634345Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:48.656632Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:48.659508Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:48.659562Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:48.661116Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:48.661146Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:48.691701Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:48.697459Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:48.705529Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:48.706532Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:48.706548Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:48.710060Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:14:48.726496Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:48.726569Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:48.756108Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:48.764889Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:48.764925Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:48.793148Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:48.809153Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:48.869538Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:48.869580Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:48.882740Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:48.910867Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:48.938849Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:48.938883Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:48.944495Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:48.945522Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:48.945537Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:48.948174Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:48.968557Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1074 success=true
2026-09-12T18:14:48.986337Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:49.132974Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:49.143355Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:49.154400Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:49.154426Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:49.172810Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:49.200066Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:49.200104Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:49.247784Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:49.251891Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:49.283959Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:49.283993Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:49.310903Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:49.310946Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:49.326240Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:49.343129Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:49.350382Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:49.356917Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:49.357687Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:49.357702Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:49.359605Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:49.368553Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:49.368580Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:49.402499Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:49.435384Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:49.437686Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:49.437707Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:49.440127Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:49.773764Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:49.786890Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:49.786921Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:49.798683Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:49.833152Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:49.834270Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:49.834285Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:49.835072Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:49.836212Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:49.855303Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:49.855334Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:49.867905Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:49.897653Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:49.935737Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:49.935762Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:49.981303Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:50.013756Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:50.070993Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:50.071021Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:50.074426Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:50.083149Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:50.083180Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.098567Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:50.101724Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:50.120823Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:50.143264Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:50.157579Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:50.157606Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.196741Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:50.219485Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:50.231911Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:50.292162Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:50.292198Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:50.292490Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:50.292521Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.318164Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:50.322762Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:50.322804Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.337586Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:50.350182Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:50.350223Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.390467Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:50.396663Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:50.402277Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:50.423154Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:50.423707Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:50.423719Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.425718Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:50.425880Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:50.436918Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:50.436943Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.453960Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:50.515003Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:50.515047Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:50.538651Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:50.558133Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:50.564282Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:50.564317Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.568302Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:50.590575Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:50.590610Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:50.609323Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:50.619109Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:50.635415Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:50.635440Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.643334Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:50.656937Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:50.656969Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.661076Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:50.675003Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:14:50.681473Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:50.684939Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:50.684987Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:50.686494Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:50.686538Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.692364Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:50.692402Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:50.703710Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:50.706658Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:50.715018Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:50.715046Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.715260Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=842 success=true
2026-09-12T18:14:50.715293Z  INFO local_candidate{attempt=41}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10096 exchange_table_bytes=27964 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:14:50.715307Z  INFO local_candidate{attempt=41}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27964 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10096 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:14:50.732366Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:50.734755Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:50.743403Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:50.814460Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:50.820941Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:50.820975Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.825793Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:50.825834Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:50.828845Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:50.829960Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:50.861391Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:50.861430Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.865693Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:50.881023Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:50.887953Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:50.915245Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:50.924578Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:50.924605Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:50.941105Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:50.941142Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:50.954684Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:50.960726Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:50.988100Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:50.988134Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.050049Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:51.055489Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:51.055513Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.060421Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:51.061322Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:51.083415Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:14:51.083440Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.085147Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:51.094176Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:14:51.120796Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:51.151089Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:51.151125Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.170906Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:51.170942Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:51.186356Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:51.189942Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:51.226218Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:51.227324Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:14:51.227339Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.229948Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:14:51.248782Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:51.249904Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:14:51.249924Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.252255Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:14:51.255453Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:51.323162Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:51.326652Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:51.326679Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.335140Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:51.392628Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:51.492602Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:51.492637Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:51.507526Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:51.536411Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:51.545410Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:51.545440Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.580782Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:51.597448Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:51.602354Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:51.602825Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:51.602832Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.604010Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:51.625084Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:51.625107Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.664732Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:51.665251Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:51.667550Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:51.667567Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.669964Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:51.686915Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:51.687419Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:51.687428Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:51.688877Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:51.758569Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1043 success=true
2026-09-12T18:14:51.917500Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:51.918591Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:51.918623Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:51.950417Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:14:51.957850Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:51.990761Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:51.990796Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.025453Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:52.028922Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:52.028949Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.033665Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:52.053147Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:52.053168Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.063241Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:52.063272Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.066193Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:52.075509Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:14:52.083525Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:14:52.090721Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:14:52.090754Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.107053Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:14:52.111711Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:52.115960Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:52.130820Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:52.145265Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:52.146140Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:52.146159Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.148454Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:52.152957Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:52.152981Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.176638Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:52.177514Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:52.177528Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.180240Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:52.190647Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:52.205629Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:52.255846Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:52.262054Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:52.294154Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:52.294185Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.337021Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:52.542043Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:14:52.559263Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:14:52.559294Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.574817Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:14:52.607331Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:14:52.608438Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:52.608453Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.610376Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:14:52.613579Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:52.613610Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:52.648676Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:52.701433Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:52.701483Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:52.730844Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:52.835009Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:14:52.843350Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:14:52.843373Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.843665Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:52.856919Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:14:52.893630Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:52.893667Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:52.897694Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:52.897725Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:52.901070Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:52.937228Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:52.979045Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:52.979586Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:52.979616Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:53.012014Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:53.012058Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.026060Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:53.030291Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:53.042045Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:53.097518Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:53.097545Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.149699Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:53.203452Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:53.209008Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:53.209028Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.215013Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:53.237492Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:53.302824Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:53.302850Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.402894Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:53.447020Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:53.447907Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:53.447922Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.449862Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:53.553894Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:53.556493Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:53.566730Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:53.575220Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:53.575255Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.579871Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:53.579911Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.597555Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:53.600227Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:53.600255Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.600552Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:53.603342Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:53.626126Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:53.647320Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:53.647352Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.649487Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:53.651625Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:53.651758Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:53.651772Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.654304Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:53.654322Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.654636Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:53.657505Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:53.683993Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:53.738007Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:53.775378Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:53.784114Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:53.784153Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.793184Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:53.824143Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:14:53.826097Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:53.826134Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.849911Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:53.849939Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.870318Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:53.883417Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:14:53.894578Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:53.894628Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:53.897501Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:53.911631Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:53.911833Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:53.911865Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.918923Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:14:53.920425Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:14:53.920439Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:53.923152Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:14:53.929952Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:14:53.965590Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:53.973249Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:14:53.988149Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:14:54.256472Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:54.282148Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:54.282174Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:54.295970Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:54.312926Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:54.319619Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:54.319646Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:54.327762Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:54.333906Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:54.334409Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:54.334417Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:54.335604Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:54.348666Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:54.352561Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:54.373423Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:54.373473Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:54.386688Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:54.386726Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:54.415298Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:54.417936Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:54.480400Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:54.587656Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:54.616448Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:54.616481Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:54.628797Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:54.642580Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:54.652555Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:54.660104Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:54.687431Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:54.687457Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:54.714295Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:54.715380Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:54.715404Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:54.745189Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:54.745235Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:54.765424Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:54.806388Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:54.814151Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:54.814179Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:54.823265Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:54.840792Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:54.899857Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:54.899897Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:54.904274Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:54.929117Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:54.954820Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:54.956417Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:54.956443Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:54.960189Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:55.014898Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:14:55.051373Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:55.062872Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:55.062896Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.063000Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:55.063029Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:55.080157Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:55.143970Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:14:55.155582Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:14:55.193651Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:14:55.193696Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.232933Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:55.232970Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:55.233741Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:14:55.254480Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:14:55.254955Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:55.254962Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.256226Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:14:55.259377Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:55.263537Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:55.271470Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:55.271504Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.274451Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:55.274805Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:55.274812Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.276217Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:55.285157Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:55.285506Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:55.285514Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.286430Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:55.291050Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:55.295052Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:55.295105Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:55.296196Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:55.296733Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:55.306428Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:55.313535Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:14:55.333801Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:55.333841Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:55.374430Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:55.376148Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:55.381665Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:55.381695Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.390631Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:55.403353Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:55.403764Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:55.403773Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.404808Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:55.430377Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:55.431227Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:55.431240Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.432697Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:55.442632Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:55.442960Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:55.442966Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.443976Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:55.658507Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:55.705461Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:14:55.732058Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:55.749693Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:14:55.749725Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.753226Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:55.753246Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.774724Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:14:55.793040Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:14:55.793079Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.826512Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:55.828737Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:55.828753Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.831809Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:55.881746Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:55.881789Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:55.883865Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:55.886127Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:14:55.888733Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:14:55.917459Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:55.929094Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:55.929135Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.948956Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:55.950909Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:55.950940Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:55.955237Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:55.973094Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:56.012317Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:56.039694Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:56.039724Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.068657Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:56.121029Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:56.121064Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:56.126421Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:56.129700Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:56.135921Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:56.137478Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:56.139708Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:56.139732Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.146115Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:56.165688Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:56.166320Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:56.166332Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.168530Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:56.168550Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.168601Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:56.179391Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:56.179790Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:56.179797Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.180798Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:56.182165Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:56.182194Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:56.185731Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:56.186734Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:56.186755Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.189858Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:56.195517Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:56.205697Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:56.206165Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:14:56.230397Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:56.230934Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:56.230942Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.231983Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:14:56.232012Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.232213Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:56.233771Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:56.239688Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:56.239709Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.245813Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:56.252222Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:14:56.256495Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:56.299096Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:56.301552Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:56.301570Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.304240Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:56.305767Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:56.317138Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=14051 success=true
2026-09-12T18:14:56.320627Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:14:56.321280Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:56.321674Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:56.321693Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.323159Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:56.323458Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:14:56.323484Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.327833Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:14:56.333267Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:56.333607Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:56.333615Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.334552Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:56.335314Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:56.339487Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:56.346038Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:56.350727Z  INFO local_candidate{attempt=36}: costed final placed program final_cycles=11829948 final_exchange=4929538
2026-09-12T18:14:56.352305Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:56.352798Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:56.352807Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.354801Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:56.375772Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:56.375804Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.381410Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:56.412479Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:56.441478Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:56.441519Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.445002Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:56.445514Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:56.445525Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.446854Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:56.465107Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:56.465143Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:56.497279Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:56.508446Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:56.522807Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:56.522843Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.523370Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:14:56.529741Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:56.532785Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:56.532804Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.535758Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:56.549943Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:56.552421Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:56.560921Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:56.565484Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:56.565904Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:56.565914Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.567518Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:56.580665Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:56.581354Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:56.581377Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.583175Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:56.591669Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:56.607572Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:56.607602Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.613391Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:56.614309Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:56.614327Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.617461Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:56.647331Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:56.791688Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:56.817025Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:14:56.817071Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.818061Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:56.818093Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:56.830556Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:14:56.847478Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:14:56.865992Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:14:56.898885Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:14:56.898919Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:56.927995Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:14:56.964990Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:14:56.989544Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:14:56.989580Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:56.998375Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:14:56.998409Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:57.002804Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:57.005107Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:14:57.018879Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:57.022597Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:14:57.043344Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:14:57.043455Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:57.057262Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:14:57.057305Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:57.058360Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:14:57.058910Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:14:57.066921Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:57.066951Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:57.081323Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:14:57.081348Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:57.094736Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:57.110272Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:14:57.221149Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:14:57.270984Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:57.271923Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:57.271938Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:57.274683Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:57.302532Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:57.329827Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:57.329866Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:57.363438Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:57.452828Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:57.463902Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:57.463923Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:57.488996Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:57.541230Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:14:57.548485Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:14:57.548513Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:57.554754Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:57.554786Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:57.556260Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:14:57.567714Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:57.579744Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:14:57.631138Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:57.631221Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:57.663055Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:57.718057Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:14:57.729190Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:14:57.729236Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:57.741076Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:14:57.770229Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:14:57.770267Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:57.799660Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:14:57.929945Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:57.930648Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:14:57.941643Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:14:57.941664Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:57.952280Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:14:57.968837Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:57.977169Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:57.977225Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:57.987558Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:57.998990Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:57.999016Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.012933Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:58.012966Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.014460Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:58.015982Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:58.033759Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:14:58.033793Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:58.063081Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:58.112105Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:14:58.209105Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:58.209145Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:58.222273Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:58.237243Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:58.245018Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:58.245053Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.253304Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:58.265651Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:58.273131Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:58.275842Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:58.277146Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:58.287609Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:58.293739Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:14:58.294007Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:14:58.304751Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:58.305119Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:58.305128Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.307113Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:58.317154Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:58.317536Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:58.317546Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.318670Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:58.323792Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:58.328162Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:58.329352Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:58.329891Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:58.332999Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:14:58.333021Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.340412Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:58.341327Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:14:58.341538Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.386992Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:14:58.387847Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:14:58.412120Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:58.416112Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:58.416129Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.422361Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:58.423126Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:58.435643Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:58.436047Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:58.436055Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.437117Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:58.443656Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=39 success=true
2026-09-12T18:14:58.446643Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:14:58.453282Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:14:58.457376Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:14:58.462586Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:58.463354Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:58.463366Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.464822Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:58.473743Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:58.474030Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:14:58.474036Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.475002Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:14:58.475612Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:58.475634Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.528792Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:14:58.528834Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.549162Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:58.554736Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:58.571783Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:14:58.579571Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:14:58.579597Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.581003Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:14:58.583308Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:58.583327Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.589226Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:58.589576Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:14:58.599454Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:14:58.603010Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:58.603429Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:58.603441Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.604885Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:58.605391Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:14:58.607527Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:14:58.608339Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:14:58.614615Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:58.614963Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:58.614970Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.615881Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:58.615987Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:14:58.619275Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:58.620848Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:58.629291Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:14:58.629660Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:58.629668Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.631194Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:14:58.634067Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:58.634603Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:58.634614Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.636550Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:58.641169Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:14:58.641285Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:58.641535Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:58.641543Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.641754Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:58.641761Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.642545Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:14:58.642934Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:58.647519Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:14:58.652957Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:14:58.654156Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:14:58.654730Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:14:58.665316Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:14:58.697090Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:58.698589Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:14:58.700500Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:58.700527Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.704434Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:58.742434Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:14:58.746889Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:14:58.746909Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.754379Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:14:58.761543Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:14:58.761575Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:58.767535Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:14:58.767941Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:14:58.767950Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.769080Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:14:58.791148Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:14:58.791801Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=1290 success=true
2026-09-12T18:14:58.796673Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:14:58.797495Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:14:58.797508Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:58.798990Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:14:58.836035Z  INFO local_candidate{attempt=44}: exchange table and repeat patch storage exchange_table_bytes=27888 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:14:58.850672Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=58 success=true
2026-09-12T18:14:58.885573Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:14:58.941789Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:14:58.941819Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.009193Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:14:59.041138Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:14:59.048863Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:14:59.070919Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:14:59.071625Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:14:59.071648Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.073753Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:14:59.079331Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:14:59.079360Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.083948Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:14:59.084336Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:14:59.084346Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.085376Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:14:59.090484Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:14:59.107074Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:14:59.107952Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:14:59.107975Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.110967Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:14:59.115685Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:14:59.116066Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:14:59.131738Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:14:59.135430Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:59.138083Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:14:59.138590Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:14:59.138599Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.139832Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:14:59.143278Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:14:59.143299Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.155663Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:59.155688Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.157985Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:14:59.158008Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.160812Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:14:59.168652Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:59.170796Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:59.183188Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:14:59.183225Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.189465Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:14:59.189637Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:14:59.191668Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:14:59.191759Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:14:59.191772Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.194332Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:14:59.209560Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:59.210136Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:59.210146Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.212298Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:59.224982Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:59.225631Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:59.225653Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.227629Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:14:59.235714Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:59.242532Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:14:59.244423Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=30585 success=true
2026-09-12T18:14:59.308603Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=417 success=true
2026-09-12T18:14:59.383183Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:14:59.383230Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:59.398067Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:14:59.581982Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:14:59.590979Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:14:59.595668Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:14:59.595691Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.602617Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:14:59.610914Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:14:59.610938Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.623548Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:14:59.623621Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:14:59.624150Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:14:59.624160Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.626668Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:14:59.638000Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:14:59.638429Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:14:59.638439Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.639533Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:14:59.644859Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:14:59.650263Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:14:59.657322Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:14:59.671234Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:14:59.672112Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:14:59.672123Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.674596Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:14:59.709670Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=14154 success=true
2026-09-12T18:14:59.722602Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:14:59.722624Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.737869Z  INFO local_candidate{attempt=31}: costed final placed program final_cycles=11833505 final_exchange=4926649
2026-09-12T18:14:59.771298Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:14:59.812005Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:14:59.831276Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:14:59.837261Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:14:59.837282Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.862352Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:14:59.876790Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:14:59.877633Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:14:59.877646Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:14:59.879782Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:14:59.901801Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:14:59.901853Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:14:59.955634Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:15:00.017608Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:15:00.022697Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:15:00.022717Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.027834Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:15:00.215514Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:15:00.252399Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:00.252449Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.284603Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:15:00.291135Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:15:00.309517Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:15:00.309542Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.313598Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:00.313632Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:00.313605Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:15:00.314117Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:00.314125Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.315395Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:15:00.338355Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:15:00.354161Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:15:00.366343Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:15:00.368652Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:15:00.368668Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.371244Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:15:00.393870Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:15:00.393956Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.408709Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:00.446454Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:15:00.615786Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:15:00.621743Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:15:00.621764Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.629122Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:15:00.638962Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:15:00.643979Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:15:00.645937Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:15:00.646772Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:15:00.692953Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:15:00.745822Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:15:00.754719Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:15:00.754758Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:00.777440Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:15:00.777482Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:00.782437Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:15:00.782460Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.790579Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:15:00.815435Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:15:00.823415Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:15:00.836560Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:15:00.842151Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:15:00.842185Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.855417Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:15:00.889178Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:00.920500Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:00.920536Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.963850Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:00.991819Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:00.992444Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:00.992455Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:00.993989Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:01.021542Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:15:01.028141Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:15:01.028172Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.037230Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:15:01.046704Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:15:01.051685Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:15:01.053528Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:15:01.054293Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:15:01.062510Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:15:01.079329Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:01.082607Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:15:01.083139Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:01.083158Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.086167Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:15:01.102462Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:15:01.103002Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:01.103020Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.104720Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:15:01.112681Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:15:01.118550Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:15:01.119773Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:15:01.120334Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:15:01.144760Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:15:01.213867Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:15:01.216887Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:15:01.216947Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.220440Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:15:01.220478Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.222924Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:01.224864Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:15:01.230436Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:15:01.240726Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:15:01.240754Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.243045Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:15:01.243436Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:15:01.243446Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.244536Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:15:01.261097Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:15:01.270236Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:15:01.270969Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:15:01.270980Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.272695Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:15:01.281679Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:15:01.281985Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:15:01.281997Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.283045Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:15:01.301395Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:01.307014Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:15:01.307040Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.329553Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:01.329576Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.338915Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:15:01.342219Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:01.356586Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:01.371839Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:01.396061Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:01.396580Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:01.396591Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.397987Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:01.402227Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:15:01.406071Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:15:01.406101Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:01.427958Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:01.433611Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:15:01.441795Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:15:01.441826Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.442076Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:15:01.452668Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:15:01.452700Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.464270Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:01.465721Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:01.465739Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.468952Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:15:01.472651Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:01.472680Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.514118Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:15:01.514162Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:01.515838Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:01.538062Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:15:01.578909Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:15:01.597304Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:15:01.615475Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:15:01.615520Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.647949Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:15:01.649771Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:15:01.655973Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:01.656989Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:01.657005Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.659698Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:15:01.687460Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:15:01.687496Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:01.695082Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:15:01.709036Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:01.709067Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:01.719115Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:01.720763Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:01.720792Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.721975Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:15:01.724951Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:15:01.745778Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:15:01.746381Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:01.746404Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.747857Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:15:01.756392Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:15:01.763329Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:15:01.787961Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:15:01.799425Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:15:01.799446Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.816304Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:15:01.880605Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:15:01.918533Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:15:01.918570Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:01.952475Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:15:01.952508Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:01.953059Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:15:01.983872Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:15:02.003293Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:15:02.003364Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.013243Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=869 success=true
2026-09-12T18:15:02.013286Z  INFO local_candidate{attempt=44}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10076 exchange_table_bytes=27888 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:15:02.013298Z  INFO local_candidate{attempt=44}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27888 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10076 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:15:02.021764Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:15:02.023543Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:15:02.036317Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:15:02.053470Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:15:02.053500Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.060866Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:15:02.063398Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:15:02.063423Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.066407Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:15:02.077328Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:15:02.082555Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:15:02.083503Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:15:02.083524Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.086081Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:15:02.089314Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=40145 success=true
2026-09-12T18:15:02.092716Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:15:02.092741Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.103395Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:15:02.123646Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:15:02.287132Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:15:02.292425Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:15:02.292449Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.297789Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:15:02.304294Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:15:02.332955Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:15:02.413949Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:15:02.413984Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.428851Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:15:02.428895Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:02.429925Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:15:02.429967Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:02.462622Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:15:02.472741Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:15:02.475879Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:15:02.507968Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:15:02.552855Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:02.552896Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.593124Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:15:02.622548Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:15:02.623166Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:02.623176Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.624707Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:15:02.693945Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:15:02.696659Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:15:02.696680Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.699703Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:15:02.722407Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:15:02.722439Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:02.735794Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:15:02.751680Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:15:02.785328Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:02.785379Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.795108Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:02.795142Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:02.835480Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:15:02.853524Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:15:02.868506Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:15:02.869339Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:02.869354Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.871447Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:15:02.882474Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:15:02.882501Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.911091Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:02.915166Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:15:02.916352Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:15:02.943332Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:15:02.945656Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:15:02.945679Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.948375Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:15:02.955077Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:02.955108Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:02.992277Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:15:03.014952Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:15:03.015485Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:03.015495Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.017557Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:15:03.032573Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:03.032886Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:15:03.037241Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1023 success=true
2026-09-12T18:15:03.065526Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:03.065570Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.083421Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:15:03.085861Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:15:03.085879Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.088723Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:15:03.113802Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:03.117233Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:15:03.117264Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.146594Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:03.147171Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:15:03.147408Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:03.147427Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.149562Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:03.153614Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:15:03.176559Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:03.176584Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.178687Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:15:03.178708Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.194175Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:15:03.221407Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:15:03.224278Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:15:03.252721Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:15:03.253289Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:03.253301Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.254651Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:15:03.270158Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:15:03.271029Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:15:03.271041Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.273086Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:15:03.317284Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:15:03.319931Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:15:03.319952Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.322588Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:15:03.364364Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:15:03.386720Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:15:03.386756Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.402696Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:15:03.437397Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:15:03.476507Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:15:03.476543Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.517820Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:03.517856Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:03.523877Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:15:03.547289Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:15:03.555370Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:03.567850Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:15:03.567875Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.580936Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:15:03.595915Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:03.595938Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.597824Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:03.631186Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:03.666768Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=40 success=true
2026-09-12T18:15:03.670554Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:15:03.677445Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:15:03.736005Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:15:03.760542Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:15:03.760574Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.773702Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:15:03.779074Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:03.830001Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:03.830046Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:03.867602Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:03.874953Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:03.874987Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:03.892181Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:15:03.938834Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:15:03.938883Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:03.980680Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:15:04.061620Z  INFO local_candidate{attempt=30}: exchange table and repeat patch storage exchange_table_bytes=27932 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:15:04.105311Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:04.105350Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:04.119485Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:15:04.165336Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:15:04.165374Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:04.174060Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:15:04.191862Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:04.210602Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:04.221505Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:04.238338Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:04.238428Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:04.240432Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:04.240465Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:04.246443Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:04.246477Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:04.250763Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:15:04.250793Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:04.256746Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:04.274769Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:15:04.277904Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:04.282896Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:04.301682Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:04.303489Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:04.303511Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:04.307015Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:04.445733Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:15:04.445776Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:04.453019Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:15:04.453054Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:04.453115Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:15:04.476081Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:15:04.493090Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:04.493128Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:04.508800Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:15:04.542282Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:04.543460Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:04.543476Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:04.546015Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:15:04.627618Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:15:04.627659Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:04.635919Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:15:04.665191Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:04.678746Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:04.678780Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:04.696535Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:04.743638Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:15:04.743674Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:04.775953Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:15:05.031795Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:05.058372Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:05.058404Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.089023Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:05.117032Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:05.117872Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:05.117895Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.120021Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:05.164653Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:15:05.186284Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:05.229897Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:05.229938Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.239513Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:15:05.239562Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.275606Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:05.343709Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:15:05.388513Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:05.389662Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:05.389681Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.392359Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:15:05.459285Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:15:05.482972Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:05.483008Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:05.496770Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:15:05.533413Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:15:05.533448Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.632403Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:05.632442Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:05.639341Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:15:05.650846Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:15:05.661121Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:15:05.661167Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:05.699920Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:05.712006Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:15:05.712748Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:15:05.712891Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:15:05.712904Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.714993Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:15:05.721393Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:15:05.721424Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.721594Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:05.726886Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:05.731648Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:05.731670Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.746273Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=4830 success=true
2026-09-12T18:15:05.757235Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:05.757266Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.769242Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:05.770560Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:05.775405Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:15:05.778125Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:15:05.791803Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:05.792336Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:05.792345Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.793031Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:05.793723Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:05.815016Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:15:05.815062Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.818854Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:15:05.827699Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=81 success=true
2026-09-12T18:15:05.833848Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:05.834920Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:15:05.834971Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:05.834985Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.835291Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:05.835303Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.836782Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:15:05.837537Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:05.845810Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:15:05.846133Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:05.846140Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.847018Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:15:05.852745Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:05.852894Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:15:05.853411Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:05.853423Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.854945Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:05.858697Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:15:05.869347Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:15:05.875866Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:15:05.878240Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:15:05.884501Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:15:05.888307Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:15:05.888324Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.895131Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:15:05.897616Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:05.902681Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:05.902719Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:05.906743Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:05.906774Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:15:05.907150Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:15:05.907157Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.908185Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:15:05.913371Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:15:05.915169Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:15:05.936691Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:15:05.937833Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:15:05.937856Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.940095Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:15:05.953233Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:15:05.953719Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:15:05.953731Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.955148Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:15:05.989728Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:15:05.989763Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:05.997662Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:06.037100Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:15:06.052475Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:15:06.053561Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:15:06.053587Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.056448Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:15:06.092146Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:15:06.153317Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:06.154968Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:06.154988Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.158970Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:15:06.165337Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:06.268964Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:15:06.269010Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.346704Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:06.372580Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:06.372613Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.403937Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:06.420892Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:15:06.426026Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:15:06.427966Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:15:06.428816Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:15:06.436600Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:15:06.449003Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:15:06.504427Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:15:06.504460Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:06.507914Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=554 success=true
2026-09-12T18:15:06.518326Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:06.519691Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:06.519716Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.522629Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:15:06.532927Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:15:06.609242Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:06.609290Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:06.624721Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:15:06.684190Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:15:06.691059Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:15:06.691087Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.701285Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:15:06.744575Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:06.745424Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:06.745442Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.747598Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:06.803852Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:15:06.804232Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:06.804243Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.805513Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:15:06.814040Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:15:06.814370Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:06.814380Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.815161Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:15:06.831487Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:15:06.846169Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:06.872890Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:15:06.880809Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:06.880842Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.890149Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:15:06.890191Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.907402Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:15:06.907436Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.912865Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:06.914615Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:15:06.934648Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:06.935128Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:06.935135Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.936440Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:06.943953Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:06.966316Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:15:06.987295Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:06.987321Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:06.998829Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:06.999538Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:06.999551Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.000997Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:07.012504Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:15:07.028269Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:07.030441Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:15:07.030472Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.041564Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:15:07.075975Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:15:07.077274Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:15:07.077294Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.080847Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:15:07.099593Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:15:07.100318Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:07.100336Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.102218Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:15:07.104116Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:15:07.110998Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:15:07.118565Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:15:07.125769Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:15:07.125787Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.141828Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:15:07.148885Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:07.148924Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:07.161153Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:15:07.199405Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:15:07.201603Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:15:07.201619Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.204025Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:15:07.210697Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:15:07.214227Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:15:07.214247Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.218641Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:15:07.530617Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:15:07.546725Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:07.555452Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:15:07.555480Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.555780Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:15:07.577654Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:15:07.577679Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.579151Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:07.579187Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.581596Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:15:07.591409Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:15:07.607581Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:07.623537Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:07.642962Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:15:07.643001Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:07.643792Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:07.643815Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.678532Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:15:07.683320Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:07.715410Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:07.716314Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:07.716328Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.718816Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:15:07.731650Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:15:07.736266Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:15:07.736290Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.741375Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:15:07.776268Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:07.789517Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:07.789552Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:07.795167Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:15:07.827734Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:07.827787Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.832304Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:15:07.839284Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:15:07.839326Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.858126Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:15:07.858161Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:07.860346Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:15:07.860377Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.865533Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:07.868591Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:15:07.882886Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:07.889515Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:15:07.895541Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:15:07.910106Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:15:07.914675Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:07.916405Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:07.916431Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.920855Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:15:07.923191Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:15:07.923225Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.939592Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:15:07.942526Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:15:07.943312Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:15:07.943328Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:07.945805Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:15:07.980861Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:15:08.077172Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:15:08.105943Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:08.105968Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:08.129762Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:08.129804Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:08.141761Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:15:08.142091Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:15:08.153071Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:08.153105Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:08.163792Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:15:08.164264Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:08.164272Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:08.165438Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:15:08.168846Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:08.168875Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:08.176465Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:08.176862Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:08.176869Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:08.178195Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:08.181690Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:15:08.196492Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:08.196950Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:08.196964Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:08.198198Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:08.203446Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:08.241147Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:08.269406Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=56777 success=true
2026-09-12T18:15:08.323465Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:15:08.323496Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:08.494449Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:15:08.604436Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:08.649881Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:15:08.696918Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:15:08.696959Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:08.718465Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:15:08.718506Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:08.720421Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:08.769789Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:15:08.807720Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:15:08.807752Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:08.883875Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:15:08.901083Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:08.953842Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:08.953877Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:08.981932Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:15:08.991373Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:09.058948Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:09.076927Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:15:09.111660Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:15:09.111686Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:09.148652Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:15:09.148685Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:09.160581Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:15:09.176918Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=41926 success=true
2026-09-12T18:15:09.301311Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:15:09.494149Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:09.494219Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:09.560499Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:09.579886Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:09.602333Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:09.602360Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:09.606061Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=39259 success=true
2026-09-12T18:15:09.606066Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=40414 success=true
2026-09-12T18:15:09.635060Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:10.026855Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:15:10.089886Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:15:10.089916Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:10.181782Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:15:10.184530Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:10.184561Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:10.266946Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:10.341558Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=31142 success=true
2026-09-12T18:15:10.341993Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=40072 success=true
2026-09-12T18:15:10.370095Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:15:10.437177Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:15:10.437220Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:10.439033Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:10.439071Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:10.485398Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:15:10.522172Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:10.977463Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:15:11.029103Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:15:11.029134Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:11.117116Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:15:11.134158Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:11.156275Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:11.156318Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:11.184663Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:15:11.186061Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:11.256480Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:15:11.256516Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:11.284871Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:15:11.297415Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=48604 success=true
2026-09-12T18:15:11.344842Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:11.344877Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:11.411666Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:11.427734Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:11.494000Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:11.494044Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:11.530555Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:15:11.530587Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:11.583611Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:11.704812Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:15:11.894230Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:11.924669Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:11.924698Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:11.952250Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:11.962531Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=39524 success=true
2026-09-12T18:15:11.962689Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=39635 success=true
2026-09-12T18:15:11.962908Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=46099 success=true
2026-09-12T18:15:11.962945Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=26272 success=true
2026-09-12T18:15:11.963019Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=43417 success=true
2026-09-12T18:15:11.963168Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=22994 success=true
2026-09-12T18:15:12.228480Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12984 success=true
2026-09-12T18:15:12.264102Z  INFO local_candidate{attempt=45}: costed final placed program final_cycles=11834505 final_exchange=4926648
2026-09-12T18:15:13.058522Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:15:13.131606Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:15:13.131659Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:13.184722Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:15:13.205718Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=35327 success=true
2026-09-12T18:15:13.383015Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:15:13.383055Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:13.388139Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:15:13.412196Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:15:13.444877Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=7299 success=true
2026-09-12T18:15:13.444981Z  INFO local_candidate{attempt=30}: placing generated tile programs linked_end=384316 host_code_base=384320 host_code_bytes=8892 generated_code_bytes=10096 exchange_table_bytes=27932 executable_ranges=[(377532, 377536), (379588, 379592), (381324, 381328), (383340, 383344), (384316, 384320), (393280, 524288)]
2026-09-12T18:15:13.445022Z  INFO local_candidate{attempt=30}: allocated package support memory linked_end=384316 profile_bytes=0 exchange_table_bytes=27932 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10096 code_address=393280 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:15:13.447269Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=21688 success=true
2026-09-12T18:15:13.499168Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:15:13.499215Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:13.549810Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:15:13.850448Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=405 success=true
2026-09-12T18:15:13.887603Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:15:13.910356Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:15:13.910381Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:13.930216Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=79 success=true
2026-09-12T18:15:13.946318Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:15:13.957787Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=10920 success=true
2026-09-12T18:15:14.188857Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=743 success=true
2026-09-12T18:15:14.296379Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:14.306897Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:15:14.324112Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:15:14.324977Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:14.324998Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.327904Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:15:14.342649Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:15:14.343045Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:14.343054Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.344164Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:15:14.349664Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:15:14.353785Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:14.354556Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:15:14.354970Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:14.354983Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=496 selected_horizon=496 endpoint_lower_bound=288 lower_bound_gap=208 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.355884Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:15:14.356445Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:15:14.357845Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=1431 row_words=13 horizon=496
2026-09-12T18:15:14.366531Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:15:14.371617Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:14.372059Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:14.372066Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.373617Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:14.391585Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:15:14.408873Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:14.411102Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:15:14.412123Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:15:14.412136Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.414091Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:15:14.420088Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:14.427817Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:15:14.432529Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:15:14.432542Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.436443Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:15:14.437149Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:14.437159Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.438737Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:15:14.439152Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:15:14.448966Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:15:14.449648Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:14.449660Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.450780Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:15:14.451388Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:15:14.451806Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:15:14.451814Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.452959Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:15:14.456498Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:15:14.461639Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:15:14.464082Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:15:14.465227Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:15:14.478986Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:15:14.479669Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:15:14.479680Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.481455Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:15:14.490080Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:15:14.490393Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1075 maximum_identical_destinations=1
2026-09-12T18:15:14.490400Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=216 selected_horizon=216 endpoint_lower_bound=4 lower_bound_gap=212 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.491457Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=46 row_words=9 horizon=216
2026-09-12T18:15:14.550790Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:15:14.551571Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=523 success=true
2026-09-12T18:15:14.552803Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:15:14.552819Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.555322Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:15:14.627423Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:14.638441Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:14.638464Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.652537Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:14.793865Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:15:14.836631Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:15:14.838359Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12749 success=true
2026-09-12T18:15:14.873315Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:15:14.873356Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:14.881796Z  INFO local_candidate{attempt=38}: costed final placed program final_cycles=11829948 final_exchange=4929538
2026-09-12T18:15:14.896135Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:15:15.005666Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:15.024768Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:15.024812Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.034541Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:15:15.040806Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:15.041342Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:15:15.041365Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.045917Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:15:15.090498Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:15.091857Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:15.091876Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.094150Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:15.175453Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:15:15.175487Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:15.211722Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:15:15.221930Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:15:15.253182Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:15:15.253227Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.283837Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:15:15.286471Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:15:15.300123Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1024 maximum_identical_destinations=1
2026-09-12T18:15:15.300144Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=528 selected_horizon=528 endpoint_lower_bound=112 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.310280Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1017 row_words=95 horizon=528
2026-09-12T18:15:15.336855Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:15:15.338063Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:15:15.338117Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.342647Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=1357 row_words=14 horizon=1112
2026-09-12T18:15:15.361220Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:15:15.361873Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=63 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:15.361887Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=63 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.363696Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=63 tile=47 row_words=25 horizon=406
2026-09-12T18:15:15.372146Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:15:15.379644Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=65
2026-09-12T18:15:15.394328Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:15:15.394370Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:15.405344Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:15:15.444370Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:15:15.451456Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:15:15.451482Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.457929Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:15:15.608024Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:15:15.608930Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-12T18:15:15.608947Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.611332Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:15:15.634005Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:15.635122Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:15.635137Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.638224Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1452 row_words=15 horizon=3578
2026-09-12T18:15:15.773718Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:15.812844Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:15.812879Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.845496Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:15:15.863333Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:15.873430Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:15:15.873469Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.894295Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:15:15.937702Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:15:15.962001Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:15:15.962024Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:15.988580Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:15:16.012456Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:16.013061Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:16.013069Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.014448Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:16.080686Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:15:16.082949Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:15:16.082965Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.085239Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:15:16.104130Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:16.104168Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:16.119358Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=452 row_words=53 horizon=8353
2026-09-12T18:15:16.122178Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:15:16.173588Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:15:16.176003Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:15:16.176037Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.183280Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:15:16.192721Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:15:16.192753Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.220573Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:15:16.235392Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:15:16.235422Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.240757Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:15:16.250014Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:15:16.250790Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:16.250805Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.252715Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:15:16.291456Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:15:16.383412Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:15:16.423926Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:15:16.423952Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.460694Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:15:16.463241Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:15:16.481714Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:15:16.481734Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.498795Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:15:16.580480Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:16.625696Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:15:16.628410Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=565 success=true
2026-09-12T18:15:16.628882Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:16.628907Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.667733Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:16.667774Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.668950Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:16.709350Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:15:16.740953Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=112 success=true
2026-09-12T18:15:16.746615Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:16.775640Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:16.775664Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:16.802782Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:17.281454Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=454 success=true
2026-09-12T18:15:17.432030Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:15:17.432070Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:17.469735Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:15:17.632364Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:15:17.695617Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:15:17.695663Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12868 selected_horizon=12868 endpoint_lower_bound=11940 lower_bound_gap=928 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:17.756081Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-12T18:15:17.816781Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:15:17.895601Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:15:17.895638Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:17.994779Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:15:18.320383Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5680 paired_horizon=11275 use_paired=false
2026-09-12T18:15:18.412125Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:15:18.412162Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5680 selected_horizon=5680 endpoint_lower_bound=4656 lower_bound_gap=1024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:18.441668Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=344 horizon=5680
2026-09-12T18:15:19.117480Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:19.117518Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:19.135988Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:15:19.201504Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:15:19.216233Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:15:19.216262Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:19.331150Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:19.334351Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:15:19.418006Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:15:19.418038Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:19.575713Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:15:21.585592Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=13316 success=true
2026-09-12T18:15:21.625325Z  INFO local_candidate{attempt=37}: costed final placed program final_cycles=11829948 final_exchange=4929538
2026-09-12T18:15:22.352872Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12746 success=true
2026-09-12T18:15:22.381089Z  INFO local_candidate{attempt=34}: costed final placed program final_cycles=11835316 final_exchange=4927462
2026-09-12T18:15:22.769989Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=13593 success=true
2026-09-12T18:15:22.789946Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11492 success=true
2026-09-12T18:15:22.802642Z  INFO local_candidate{attempt=27}: costed final placed program final_cycles=12066166 final_exchange=4942258
2026-09-12T18:15:22.813782Z  INFO local_candidate{attempt=35}: costed final placed program final_cycles=11835316 final_exchange=4927462
2026-09-12T18:15:22.961187Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:15:22.982003Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=199 success=true
2026-09-12T18:15:23.078944Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=96 success=true
2026-09-12T18:15:23.092679Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:15:23.092727Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:23.149860Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:15:23.190471Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=9001 success=true
2026-09-12T18:15:23.417755Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11455 success=true
2026-09-12T18:15:23.441563Z  INFO local_candidate{attempt=43}: costed final placed program final_cycles=11835316 final_exchange=4927462
2026-09-12T18:15:23.682782Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=460 success=true
2026-09-12T18:15:23.845826Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=283 success=true
2026-09-12T18:15:23.934265Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=88 success=true
2026-09-12T18:15:24.277049Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=13935 success=true
2026-09-12T18:15:24.321549Z  INFO local_candidate{attempt=25}: costed final placed program final_cycles=12066166 final_exchange=4942258
2026-09-12T18:15:24.589012Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=577 success=true
2026-09-12T18:15:24.589074Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=506 success=true
2026-09-12T18:15:24.671645Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=82 success=true
2026-09-12T18:15:24.683140Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=94 success=true
2026-09-12T18:15:24.760612Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=603 success=true
2026-09-12T18:15:24.853451Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=242 success=true
2026-09-12T18:15:24.934475Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11728 success=true
2026-09-12T18:15:24.934678Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=81 success=true
2026-09-12T18:15:24.971029Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=13007 success=true
2026-09-12T18:15:24.973818Z  INFO local_candidate{attempt=28}: costed final placed program final_cycles=11833505 final_exchange=4926649
2026-09-12T18:15:25.002180Z  INFO local_candidate{attempt=29}: costed final placed program final_cycles=11833755 final_exchange=4926648
2026-09-12T18:15:25.050758Z  INFO local_candidate{attempt=34}: retained faster incumbent candidate_cycles=11835316 cycles=11835316
2026-09-12T18:15:25.355730Z  INFO local_candidate{attempt=27}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=463 success=true
2026-09-12T18:15:25.411150Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=409 success=true
2026-09-12T18:15:25.437121Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=550 success=true
2026-09-12T18:15:25.628541Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11670 success=true
2026-09-12T18:15:25.642999Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=16036 success=true
2026-09-12T18:15:25.665191Z  INFO local_candidate{attempt=44}: costed final placed program final_cycles=11835316 final_exchange=4927462
2026-09-12T18:15:25.684056Z  INFO local_candidate{attempt=39}: costed final placed program final_cycles=11836320 final_exchange=4928281
2026-09-12T18:15:25.692415Z  INFO local_candidate{attempt=43}: retained faster incumbent candidate_cycles=11835316 cycles=11835316
2026-09-12T18:15:25.705393Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=202 success=true
2026-09-12T18:15:25.745859Z  INFO local_candidate{attempt=27}: retained faster incumbent candidate_cycles=12066166 cycles=11835316
2026-09-12T18:15:25.803912Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=98 success=true
2026-09-12T18:15:25.827776Z  INFO local_candidate{attempt=35}: retained faster incumbent candidate_cycles=11835316 cycles=11835316
2026-09-12T18:15:25.836515Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=13873 success=true
2026-09-12T18:15:25.869887Z  INFO local_candidate{attempt=32}: costed final placed program final_cycles=11835316 final_exchange=4927462
2026-09-12T18:15:26.437056Z  INFO local_candidate{attempt=25}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=468 success=true
2026-09-12T18:15:26.491513Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=13044 success=true
2026-09-12T18:15:26.519457Z  INFO local_candidate{attempt=41}: costed final placed program final_cycles=11831977 final_exchange=4923484
2026-09-12T18:15:26.740480Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=321 success=true
2026-09-12T18:15:26.740490Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=225 success=true
2026-09-12T18:15:26.771240Z  INFO local_candidate{attempt=25}: retained faster incumbent candidate_cycles=12066166 cycles=11835316
2026-09-12T18:15:26.827762Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=87 success=true
2026-09-12T18:15:26.849595Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=109 success=true
2026-09-12T18:15:27.094282Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=290 success=true
2026-09-12T18:15:27.094479Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=218 success=true
2026-09-12T18:15:27.176733Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=82 success=true
2026-09-12T18:15:27.195094Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=100 success=true
2026-09-12T18:15:27.421349Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=236 success=true
2026-09-12T18:15:27.525809Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=104 success=true
2026-09-12T18:15:27.531981Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=432 success=true
2026-09-12T18:15:27.600848Z  INFO local_candidate{attempt=28}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=512 success=true
2026-09-12T18:15:27.821884Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=395 success=true
2026-09-12T18:15:27.870818Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=468 success=true
2026-09-12T18:15:27.876797Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=154 success=true
2026-09-12T18:15:27.969617Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=92 success=true
2026-09-12T18:15:28.020410Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=436 success=true
2026-09-12T18:15:28.040264Z  INFO local_candidate{attempt=44}: retained faster incumbent candidate_cycles=11835316 cycles=11835316
2026-09-12T18:15:28.132885Z  INFO local_candidate{attempt=39}: retained faster incumbent candidate_cycles=11836320 cycles=11835316
2026-09-12T18:15:28.301707Z  INFO local_candidate{attempt=32}: retained faster incumbent candidate_cycles=11835316 cycles=11835316
2026-09-12T18:15:28.482814Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=421 success=true
2026-09-12T18:15:29.034643Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=17071 success=true
2026-09-12T18:15:29.065171Z  INFO local_candidate{attempt=26}: costed final placed program final_cycles=12066166 final_exchange=4942258
2026-09-12T18:15:30.381346Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=99 success=true
2026-09-12T18:15:30.482357Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=100 success=true
2026-09-12T18:15:30.990988Z  INFO local_candidate{attempt=26}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=453 success=true
2026-09-12T18:15:31.058949Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=20717 success=true
2026-09-12T18:15:31.091106Z  INFO local_candidate{attempt=40}: costed final placed program final_cycles=11831988 final_exchange=4923484
2026-09-12T18:15:31.284881Z  INFO local_candidate{attempt=26}: retained faster incumbent candidate_cycles=12066166 cycles=11835316
2026-09-12T18:15:31.679623Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=19716 success=true
2026-09-12T18:15:31.715599Z  INFO local_candidate{attempt=42}: costed final placed program final_cycles=11833735 final_exchange=4927339
2026-09-12T18:15:32.196408Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=20233 success=true
2026-09-12T18:15:32.232753Z  INFO local_candidate{attempt=33}: costed final placed program final_cycles=11835316 final_exchange=4927462
2026-09-12T18:15:32.328537Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=97 success=true
2026-09-12T18:15:32.428036Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=99 success=true
2026-09-12T18:15:32.938746Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=461 success=true
2026-09-12T18:15:32.942317Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=102 success=true
2026-09-12T18:15:33.036809Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=94 success=true
2026-09-12T18:15:33.489148Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=402 success=true
2026-09-12T18:15:33.497276Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=101 success=true
2026-09-12T18:15:33.590683Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=93 success=true
2026-09-12T18:15:34.079326Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=425 success=true
2026-09-12T18:15:34.314620Z  INFO local_candidate{attempt=33}: retained faster incumbent candidate_cycles=11835316 cycles=11835316
2026-09-12T18:15:34.324371Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11133 success=true
2026-09-12T18:15:34.366013Z  INFO local_candidate{attempt=30}: costed final placed program final_cycles=11840259 final_exchange=4932486
2026-09-12T18:15:35.785931Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=103 success=true
2026-09-12T18:15:35.882586Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=96 success=true
2026-09-12T18:15:36.378519Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=446 success=true
2026-09-12T18:15:36.637740Z  INFO local_candidate{attempt=30}: retained faster incumbent candidate_cycles=11840259 cycles=11835316
2026-09-12T18:15:38.572283Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=28 before=11835316 after=11833505 changed_operations=[41, 42] opened_boundaries=[395]
2026-09-12T18:15:39.625063Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: saved mid-plan search state path=artifacts/search-state-20260912/bs1/state.json attempts=29 bytes=19912803
2026-09-12T18:15:41.143492Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-0-480354-0042.json scope="local-29-candidate-0" peak_step=62 effective_peak_bytes=472824
2026-09-12T18:15:41.195016Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-1-480354-0043.json scope="local-29-candidate-1" peak_step=62 effective_peak_bytes=472824
2026-09-12T18:15:41.242046Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-2-480354-0044.json scope="local-29-candidate-2" peak_step=62 effective_peak_bytes=472824
2026-09-12T18:15:41.295775Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-3-480354-0045.json scope="local-29-candidate-3" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:15:41.343621Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-4-480354-0046.json scope="local-29-candidate-4" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:15:41.395813Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-5-480354-0047.json scope="local-29-candidate-5" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:15:41.446385Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-6-480354-0048.json scope="local-29-candidate-6" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:15:41.493275Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-7-480354-0049.json scope="local-29-candidate-7" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:15:41.547000Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-8-480354-0050.json scope="local-29-candidate-8" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:15:41.592411Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-9-480354-0051.json scope="local-29-candidate-9" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:15:41.638072Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-10-480354-0052.json scope="local-29-candidate-10" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:15:41.689073Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-11-480354-0053.json scope="local-29-candidate-11" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:15:41.735563Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-12-480354-0054.json scope="local-29-candidate-12" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:15:41.783003Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-29-candidate-13-480354-0055.json scope="local-29-candidate-13" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:15:41.784879Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=14 threads=24
2026-09-12T18:15:48.967777Z  INFO local_candidate{attempt=31}: screened exchange table geometry expansion_ms=6053 expansion_and_footprint_ms=7182 estimated_row_bytes=37160 heuristic_row_bytes=102860 geometry_fragments_per_tile=4266 fragment_limit=16384
2026-09-12T18:15:49.086766Z  INFO local_candidate{attempt=31}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:49.454600Z  INFO local_candidate{attempt=37}: screened exchange table geometry expansion_ms=6446 expansion_and_footprint_ms=7669 estimated_row_bytes=37704 heuristic_row_bytes=105744 geometry_fragments_per_tile=4323 fragment_limit=16384
2026-09-12T18:15:49.514303Z  INFO local_candidate{attempt=39}: screened exchange table geometry expansion_ms=6452 expansion_and_footprint_ms=7729 estimated_row_bytes=37704 heuristic_row_bytes=105744 geometry_fragments_per_tile=4323 fragment_limit=16384
2026-09-12T18:15:49.568432Z  INFO local_candidate{attempt=37}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:49.597249Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:15:49.604372Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:15:49.610152Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:15:49.610751Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:49.611526Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:49.611538Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.613141Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:49.614476Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:15:49.614840Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:49.614848Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.616162Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:15:49.624262Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:15:49.624574Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:49.624581Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.625353Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:15:49.626128Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:49.627468Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:49.627490Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.629807Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:15:49.630879Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:49.633857Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:15:49.634944Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:15:49.635500Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:15:49.638849Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:49.639082Z  INFO local_candidate{attempt=39}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:49.640087Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:49.640104Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.642426Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:49.656652Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:49.658274Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:15:49.658940Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:49.658952Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.660513Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:15:49.665893Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:49.668381Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:15:49.673428Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:15:49.677860Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:15:49.677873Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.678441Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:15:49.684444Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:15:49.684548Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:49.692105Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:15:49.692672Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:15:49.692685Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.694686Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:15:49.696298Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:15:49.696669Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:15:49.696676Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.697668Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:15:49.706583Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:15:49.706929Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:49.706936Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.707893Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:15:49.713478Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:15:49.720745Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:15:49.721427Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:15:49.721439Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.722923Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:15:49.725649Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:15:49.726191Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:15:49.726199Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.727930Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:15:49.854108Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:49.862739Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:49.862756Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:49.872615Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:49.918533Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:15:49.918568Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:49.939666Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:15:50.024024Z  INFO local_candidate{attempt=29}: screened exchange table geometry expansion_ms=6951 expansion_and_footprint_ms=8239 estimated_row_bytes=37160 heuristic_row_bytes=102860 geometry_fragments_per_tile=4266 fragment_limit=16384
2026-09-12T18:15:50.057322Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:15:50.057353Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:50.064766Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:15:50.180511Z  INFO local_candidate{attempt=42}: screened exchange table geometry expansion_ms=7013 expansion_and_footprint_ms=8395 estimated_row_bytes=37432 heuristic_row_bytes=105524 geometry_fragments_per_tile=4300 fragment_limit=16384
2026-09-12T18:15:50.185351Z  INFO local_candidate{attempt=29}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:50.194688Z  INFO local_candidate{attempt=40}: screened exchange table geometry expansion_ms=7143 expansion_and_footprint_ms=8409 estimated_row_bytes=37256 heuristic_row_bytes=104376 geometry_fragments_per_tile=4282 fragment_limit=16384
2026-09-12T18:15:50.322471Z  INFO local_candidate{attempt=40}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:50.340984Z  INFO local_candidate{attempt=42}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:50.346343Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:15:50.369197Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:15:50.369234Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:50.391361Z  INFO local_candidate{attempt=35}: screened exchange table geometry expansion_ms=7350 expansion_and_footprint_ms=8606 estimated_row_bytes=37320 heuristic_row_bytes=105164 geometry_fragments_per_tile=4288 fragment_limit=16384
2026-09-12T18:15:50.399260Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:15:50.512812Z  INFO local_candidate{attempt=35}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:50.534331Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:15:50.539297Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:15:50.539315Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:50.545141Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:15:50.575372Z  INFO local_candidate{attempt=32}: screened exchange table geometry expansion_ms=7504 expansion_and_footprint_ms=8790 estimated_row_bytes=37240 heuristic_row_bytes=104300 geometry_fragments_per_tile=4284 fragment_limit=16384
2026-09-12T18:15:50.575977Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:15:50.587472Z  INFO local_candidate{attempt=34}: screened exchange table geometry expansion_ms=7450 expansion_and_footprint_ms=8802 estimated_row_bytes=37320 heuristic_row_bytes=105164 geometry_fragments_per_tile=4288 fragment_limit=16384
2026-09-12T18:15:50.591368Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:15:50.591393Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:50.601023Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:15:50.631118Z  INFO local_candidate{attempt=33}: screened exchange table geometry expansion_ms=7576 expansion_and_footprint_ms=8846 estimated_row_bytes=37320 heuristic_row_bytes=105164 geometry_fragments_per_tile=4288 fragment_limit=16384
2026-09-12T18:15:50.696801Z  INFO local_candidate{attempt=32}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:50.720184Z  INFO local_candidate{attempt=34}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:50.747216Z  INFO local_candidate{attempt=41}: screened exchange table geometry expansion_ms=7609 expansion_and_footprint_ms=8962 estimated_row_bytes=37256 heuristic_row_bytes=104376 geometry_fragments_per_tile=4282 fragment_limit=16384
2026-09-12T18:15:50.758826Z  INFO local_candidate{attempt=33}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:50.822087Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:15:50.828293Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:50.848865Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:50.848887Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:50.859232Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:50.859259Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:50.865330Z  INFO local_candidate{attempt=30}: screened exchange table geometry expansion_ms=7910 expansion_and_footprint_ms=9080 estimated_row_bytes=37160 heuristic_row_bytes=102860 geometry_fragments_per_tile=4266 fragment_limit=16384
2026-09-12T18:15:50.870572Z  INFO local_candidate{attempt=41}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:50.882421Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:15:50.904613Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:50.905472Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:15:50.906000Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:50.906008Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:50.907274Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:15:50.917715Z  INFO local_candidate{attempt=38}: screened exchange table geometry expansion_ms=7793 expansion_and_footprint_ms=9132 estimated_row_bytes=37704 heuristic_row_bytes=105744 geometry_fragments_per_tile=4323 fragment_limit=16384
2026-09-12T18:15:50.967679Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:15:50.969879Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:15:50.969895Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:50.972315Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:15:50.998840Z  INFO local_candidate{attempt=30}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:51.037355Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:15:51.039710Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:15:51.045913Z  INFO local_candidate{attempt=38}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:51.051299Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:15:51.051322Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.062552Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:15:51.062572Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.074555Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:15:51.083564Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:15:51.103037Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:51.103992Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:51.104017Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.106857Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:51.151948Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:15:51.154121Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:15:51.154137Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.157056Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:15:51.162624Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:51.177120Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:51.177150Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:51.195213Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:15:51.339776Z  INFO local_candidate{attempt=36}: screened exchange table geometry expansion_ms=8268 expansion_and_footprint_ms=9554 estimated_row_bytes=37320 heuristic_row_bytes=105164 geometry_fragments_per_tile=4288 fragment_limit=16384
2026-09-12T18:15:51.346364Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:15:51.371714Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:51.384791Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:15:51.384816Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.384911Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:51.384927Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.395067Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:51.401771Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:51.402658Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:51.402673Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.404745Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:15:51.409317Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:51.421290Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:51.422384Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:51.422396Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.424321Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:51.427069Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:51.427093Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.430665Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:15:51.438787Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:51.458852Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:15:51.461264Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:15:51.466881Z  INFO local_candidate{attempt=36}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:15:51.470674Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:51.471871Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:51.471888Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.474787Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:51.515437Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:51.516374Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:51.516397Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.518810Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:51.524063Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:15:51.536940Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:15:51.537330Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:51.537342Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.538712Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:15:51.592313Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:51.597076Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:15:51.603351Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:15:51.603373Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.610414Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:15:51.620325Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:15:51.631536Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:51.631952Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:51.631959Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.633219Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:51.647311Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:51.655741Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:51.655758Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.666503Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:51.681263Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:51.718544Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:51.726727Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:51.726752Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.741911Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:51.909008Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:51.931746Z  INFO local_candidate{attempt=31}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:15:51.958947Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:51.958986Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:51.959859Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:15:51.972556Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:15:51.972588Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:51.983241Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:15:51.985272Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:15:51.985291Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.001033Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:52.001391Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:52.001605Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:52.001614Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.002990Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:52.010324Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:15:52.019260Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:15:52.021715Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:15:52.029861Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:15:52.029880Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.031787Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:15:52.049641Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:15:52.050194Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:52.050222Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.052451Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:15:52.052479Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:15:52.057685Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:52.067395Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:15:52.067923Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:52.067936Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.069383Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:15:52.077000Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:15:52.083689Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:15:52.085419Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:15:52.086217Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:15:52.100594Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:15:52.139044Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:52.152425Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:52.152460Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.168344Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:52.181666Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:15:52.185343Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:15:52.185362Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.189121Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:15:52.191521Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:15:52.194455Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:15:52.194472Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.198510Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:52.199023Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:15:52.199648Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:52.199662Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.201867Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:52.202560Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:15:52.202909Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:15:52.202916Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.203839Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:15:52.227817Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:15:52.228618Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:15:52.228630Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.230065Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:15:52.269131Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:52.282342Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:52.282365Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.288445Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:15:52.292499Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:52.300765Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:15:52.308262Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:15:52.308281Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.318939Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:52.320074Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:52.320086Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.321319Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:15:52.321343Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.321588Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:15:52.322082Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:52.349051Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:15:52.367900Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:15:52.370271Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:15:52.370290Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.374379Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:15:52.422529Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:52.428875Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:52.431531Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:52.431550Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.443420Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:52.444588Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:52.444620Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.460620Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:52.492745Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:52.494936Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:52.496135Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:52.496151Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.498130Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:52.506347Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:52.506365Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.516654Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:52.553620Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:52.554836Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:52.554851Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.557131Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:52.561439Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:52.575581Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:52.575603Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.587157Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:52.600731Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:52.610632Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:52.610662Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.617867Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:52.619035Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:52.619050Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.621225Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:52.623524Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:52.628786Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:52.645815Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:52.659442Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:52.659469Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.659808Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:52.659828Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.675908Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:52.701269Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:52.709930Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:52.711246Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:52.711263Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.714198Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:52.734632Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:52.735812Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:52.735827Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.739044Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:52.755270Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:52.756060Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:52.756068Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.757791Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:52.764080Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:52.769468Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:52.773469Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:52.773488Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.785639Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:52.796219Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:52.796242Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.802891Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:52.803424Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:52.812651Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:52.812676Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.813510Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:52.825586Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:52.830926Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:52.861699Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:52.867995Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:52.869337Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:52.870461Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:52.871514Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:52.871539Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.876459Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:52.880369Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:52.880391Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.883410Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:52.883437Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.888579Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:52.888612Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.891245Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:52.894409Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:52.895173Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:52.895181Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.895809Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:52.896754Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:52.902048Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:52.919708Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:52.920970Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:52.920985Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.923416Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:52.942136Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:52.943938Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:52.945971Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:52.945992Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.949771Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:52.952081Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:52.953627Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:52.962693Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:52.962710Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.973874Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:15:52.974486Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:52.985797Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:15:52.985815Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:52.987040Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:15:52.991807Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:15:53.008576Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:15:53.008599Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.009218Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:15:53.009364Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:15:53.009882Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:15:53.009890Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.010938Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:15:53.011759Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:15:53.021923Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:15:53.022323Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:53.022332Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.023277Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:15:53.028044Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:15:53.028353Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:15:53.032175Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:15:53.032905Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:15:53.032922Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.033235Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:15:53.039729Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:15:53.052412Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:15:53.052920Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:53.052945Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.055094Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:15:53.069911Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:15:53.070421Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:53.070437Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.070670Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:15:53.071571Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:15:53.076575Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:15:53.077551Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:15:53.077580Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.080724Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:15:53.081853Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:15:53.082401Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:15:53.088796Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:15:53.091077Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:15:53.091092Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.091554Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:15:53.094501Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:15:53.150092Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:15:53.150957Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:53.153954Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:15:53.153969Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.160329Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:15:53.161002Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:53.161017Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.166629Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:15:53.171381Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:15:53.171735Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:15:53.171742Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.172665Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:15:53.173030Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:53.196104Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:15:53.196784Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:15:53.196795Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.198192Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:15:53.212661Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:53.221764Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:53.221782Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.235409Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:53.321708Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:15:53.343011Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:15:53.343034Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.348682Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:53.351229Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:15:53.356995Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:15:53.362152Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:53.362169Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.365561Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:15:53.365579Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.372534Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:53.376086Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:15:53.401633Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:53.403397Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:53.403419Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.407073Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:53.408026Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:15:53.409070Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:15:53.409745Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:53.409767Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.412269Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:15:53.412293Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.412848Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:15:53.416419Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:15:53.423445Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:53.450401Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:53.450428Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.485966Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:53.526687Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:15:53.526715Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:53.529804Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:15:53.549892Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:15:53.549925Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:53.581701Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:53.597061Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:53.620427Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:53.646455Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:53.646479Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.667959Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:53.675637Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:15:53.676973Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:53.676991Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.680462Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:53.685870Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:15:53.685899Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.689053Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:53.696778Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:15:53.702317Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:15:53.711896Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:53.713021Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:53.713033Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.715620Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:53.730927Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:53.731598Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:53.731607Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.733088Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:53.744185Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:15:53.760227Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:53.776061Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:15:53.776095Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.785742Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:53.795449Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:53.799323Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:53.799354Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.808138Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:15:53.825907Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:53.834256Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:53.849065Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:15:53.852223Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:53.852243Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.860463Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:15:53.860487Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.865926Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:15:53.867300Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:53.867324Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=4 initial_horizon=496 selected_horizon=496 endpoint_lower_bound=288 lower_bound_gap=208 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:53.867583Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:53.869623Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=4 tile=1431 row_words=13 horizon=496
2026-09-12T18:15:53.882463Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:15:53.882707Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=5 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:53.882721Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=5 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:53.882962Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:15:53.882971Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.883941Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=5 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:53.884736Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:15:53.885423Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:53.894537Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:15:53.894817Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:53.894832Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.894895Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:53.894902Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.895784Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:15:53.900444Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:15:53.904501Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:15:53.905509Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:15:53.911456Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:15:53.918388Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:53.920225Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:53.920250Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.925023Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:53.927449Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:15:53.928008Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:53.928027Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.930340Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:15:53.937458Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:53.940053Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:53.940864Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:15:53.941369Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:53.941387Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.942478Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:15:53.944129Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:53.944828Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:53.944842Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.946462Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:53.947321Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:15:53.951239Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:15:53.952319Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:15:53.952836Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:15:53.954301Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:53.961438Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:15:53.970493Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:53.971586Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:53.971613Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.974312Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:53.975148Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:15:53.975172Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:53.989507Z  INFO local_candidate{attempt=31}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:15:53.989513Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:53.990500Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:53.991282Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:53.991293Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:53.992818Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:53.998809Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:54.010391Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:15:54.030912Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:15:54.034615Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:15:54.034634Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.040578Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:15:54.045038Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:15:54.045065Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:54.045084Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:54.047330Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:54.051966Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:15:54.052316Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:15:54.052328Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.053223Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:15:54.056264Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:54.061407Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:15:54.066581Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:15:54.066608Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.071324Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:15:54.079656Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:15:54.080474Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:15:54.080498Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.080672Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:54.080699Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.081792Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:15:54.088347Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:15:54.112424Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:54.113115Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:54.113126Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.114650Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:54.117610Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:15:54.117633Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.121461Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:54.146194Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:15:54.152009Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:54.153046Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:54.153061Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.155608Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:54.161811Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:15:54.168121Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:54.170419Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:54.171037Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:54.171045Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.172565Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:54.184879Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:15:54.194086Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:15:54.201332Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:54.210071Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:15:54.210650Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:54.210665Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.213524Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:15:54.214773Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:54.216416Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:54.225451Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:15:54.225672Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:54.225973Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:54.225988Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.226525Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:54.226549Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.227526Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:15:54.235693Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:15:54.241285Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:15:54.242752Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:15:54.243445Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:15:54.243969Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:54.243993Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.255484Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:15:54.273060Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:54.286689Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:54.311518Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:54.312738Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:54.312755Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.316846Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:54.319041Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:54.320353Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:54.320375Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.322940Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:54.335400Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:54.336560Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:54.336583Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.337720Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:15:54.338988Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:54.339118Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:54.339980Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:54.339991Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.341648Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:54.341929Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:15:54.341941Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.350535Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:15:54.364186Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:15:54.364632Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:15:54.364645Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.365915Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:15:54.389978Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:54.393847Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:15:54.394685Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:15:54.394696Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.395915Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:54.396615Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:15:54.400099Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:54.409248Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:54.424565Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:15:54.424601Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:54.461840Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:15:54.589365Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=34 candidates=6561 ordinary_horizon=7923 paired_horizon=6885 use_paired=false
2026-09-12T18:15:54.625740Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:15:54.625776Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:54.637697Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:15:54.664990Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:15:54.665027Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:54.667282Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:54.673929Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:15:54.693829Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:54.693852Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.694078Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:15:54.696081Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:15:54.696100Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.698350Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:15:54.709438Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:15:54.728461Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:54.734869Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:54.734892Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.767792Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:15:54.768500Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:15:54.768518Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:54.771673Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:15:54.774342Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:15:54.779399Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:15:54.779417Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.785003Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:15:54.801873Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:15:54.802389Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:15:54.802401Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.804160Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:15:54.816363Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:15:54.816952Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:54.816967Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.818419Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:15:54.821270Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:15:54.823283Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:15:54.823333Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.825319Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:15:54.827812Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:15:54.831456Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:15:54.839620Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:54.842677Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:15:54.845830Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:15:54.846529Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:15:54.846538Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.848111Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:15:54.849566Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:54.888941Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:15:54.888965Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:54.892161Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:15:54.901948Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:15:54.952962Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:15:55.000938Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:15:55.015552Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:15:55.015969Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:55.015978Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.017479Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:15:55.027609Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:15:55.027976Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:55.027984Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.028988Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:15:55.034322Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:15:55.047837Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:15:55.048438Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:15:55.048448Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.050448Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:15:55.241894Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:15:55.256277Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:15:55.256300Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.264263Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:15:55.287145Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:15:55.287999Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:15:55.288012Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.290644Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:15:55.302997Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:15:55.303498Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:15:55.303508Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.304835Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:15:55.310643Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:15:55.315723Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:15:55.325556Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:15:55.347111Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:15:55.349004Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:15:55.349029Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.353464Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:15:55.356706Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:15:55.356730Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.384308Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:15:55.547304Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:15:55.571152Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:15:55.595363Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:15:55.595392Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.609801Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:15:55.609835Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.611375Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:15:55.631773Z  INFO local_candidate{attempt=37}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:15:55.658438Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:15:55.664651Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:15:55.666872Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:15:55.666888Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.669595Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:15:55.687240Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:15:55.699192Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:15:55.704484Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:15:55.704520Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:55.715273Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:15:55.715306Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.732601Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:15:55.757275Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:15:55.761909Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:15:55.761938Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.789308Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:15:55.790085Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:55.790100Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.792107Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:15:55.800109Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:15:55.819675Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:15:55.820520Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:15:55.820533Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.822931Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:15:55.832539Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:15:55.875528Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:15:55.891149Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:15:55.891671Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:55.891684Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.893271Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:15:55.904168Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:15:55.904621Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:55.904631Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.905707Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:15:55.911276Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:15:55.929463Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:15:55.930669Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:15:55.930693Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:55.933788Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:15:56.009861Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:15:56.057359Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:15:56.061406Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:15:56.061437Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.069545Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:15:56.069566Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.086315Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:15:56.140918Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:15:56.185382Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:15:56.201724Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:15:56.202239Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:56.202253Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.203802Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:15:56.215493Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:15:56.215933Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:56.215945Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.217008Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:15:56.222969Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:15:56.238050Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:15:56.238837Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:15:56.238856Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.241142Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:15:56.387736Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:15:56.414395Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:15:56.414422Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.447122Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:15:56.646787Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:15:56.684392Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:15:56.693703Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:15:56.693737Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.726007Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:15:56.778095Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:15:56.778130Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.788329Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:15:56.823352Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:15:56.823375Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.879652Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:15:56.887846Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:15:56.925666Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:15:56.925706Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:56.940657Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:15:56.950405Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:15:56.951832Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:15:56.951855Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.955071Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:15:56.972369Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:56.972878Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:56.972885Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:56.974230Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:57.020110Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:57.067039Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:15:57.074695Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:15:57.074723Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.084846Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:15:57.099036Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:15:57.113064Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:15:57.113092Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:57.114162Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:15:57.130848Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:57.131321Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:57.131329Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.132761Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:57.139345Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:15:57.167848Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:15:57.167873Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.179759Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:57.209875Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:15:57.227790Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:15:57.242700Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:15:57.243498Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:57.243517Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.245543Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:15:57.275942Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:15:57.275977Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.315502Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:15:57.317758Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:15:57.317774Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.320378Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:15:57.340574Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:15:57.387943Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:15:57.401709Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:15:57.402109Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:57.402120Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.403816Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:15:57.669762Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:15:57.698986Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:15:57.704657Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:15:57.713798Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:15:57.713829Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.724986Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:15:57.725025Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.737804Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:15:57.737829Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.737955Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:15:57.768333Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:15:57.789158Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:15:57.811329Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:15:57.811376Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:57.859490Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:15:57.944010Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:15:57.953015Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:15:57.953062Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:57.963556Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:15:57.978394Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:15:57.986739Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:15:57.989269Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:15:57.991593Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:15:57.994614Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:15:58.001136Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:15:58.001157Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.009752Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:15:58.020551Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:15:58.026126Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:15:58.027710Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:15:58.027729Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.028280Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:15:58.039361Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:58.039782Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:58.039788Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.041415Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:58.062361Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:15:58.073813Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:15:58.086735Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:15:58.086762Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.093228Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:58.111341Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:15:58.256107Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:15:58.264289Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:15:58.264320Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.274681Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:15:58.281365Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:15:58.283119Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:15:58.287739Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:15:58.288868Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:15:58.288888Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.295404Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:15:58.297629Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:15:58.297641Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:15:58.306507Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:15:58.306536Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.321039Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:15:58.333288Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:15:58.368805Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:15:58.368846Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.380282Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:15:58.382476Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:15:58.382495Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.385219Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:15:58.394022Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:15:58.405795Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:15:58.448270Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:15:58.448293Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.526441Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:15:58.557699Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:15:58.562512Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:15:58.562534Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.569519Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:15:58.571249Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:15:58.585491Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:15:58.585915Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:15:58.585925Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.587425Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:15:58.597146Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:15:58.597537Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:15:58.597560Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.598579Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:15:58.603577Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:15:58.616761Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:15:58.617359Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:15:58.617371Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:58.619407Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:15:58.692778Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:15:58.692814Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:58.720161Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:15:58.905285Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:15:58.905329Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:58.916368Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:15:58.951993Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:15:58.976861Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:15:58.976884Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:59.002584Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:15:59.034861Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:15:59.059295Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:15:59.059319Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:59.089654Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:15:59.090836Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:15:59.091085Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:15:59.126792Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:15:59.126823Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:59.159849Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:15:59.165291Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:15:59.165316Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:59.165866Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:15:59.171591Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:15:59.193633Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:15:59.193680Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:59.200320Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:15:59.201323Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:15:59.201344Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:59.203435Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:15:59.264261Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:15:59.350486Z  INFO local_candidate{attempt=31}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:15:59.405000Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:15:59.481775Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:15:59.481812Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:15:59.534977Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:15:59.554974Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:15:59.577292Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:15:59.577315Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:59.597593Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:15:59.666100Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:15:59.669383Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:15:59.669407Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:15:59.674418Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:00.257077Z  INFO local_candidate{attempt=41}: compared ordinary and paired exchange schedules phase=34 candidates=6561 ordinary_horizon=7923 paired_horizon=6885 use_paired=false
2026-09-12T18:16:00.263397Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:00.297990Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:00.298019Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.304095Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:00.304127Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:00.320312Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:16:00.323990Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:00.368015Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:00.370264Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:00.370282Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.373332Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:00.384905Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:00.394075Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:00.418871Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:00.418895Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.433332Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:00.433373Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.451251Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:00.465027Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:00.470750Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:00.470775Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.477132Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:00.495404Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:00.603374Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:00.624441Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:00.624486Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.640321Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:00.680530Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:00.687494Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:00.687534Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.693973Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:00.696352Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:00.696375Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.698880Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:00.699159Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:00.714082Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:00.723254Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:00.726287Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:00.727612Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:00.738691Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:00.755715Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:00.756140Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:00.756149Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.758298Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:00.769258Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:00.769643Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:00.769652Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.770687Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:00.775955Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:00.780526Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:00.781756Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:00.782328Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:00.831101Z  INFO local_candidate{attempt=42}: compared ordinary and paired exchange schedules phase=56 candidates=36 ordinary_horizon=232 paired_horizon=1392 use_paired=false
2026-09-12T18:16:00.900776Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:00.908709Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:00.908745Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.914135Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:00.920007Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:00.933844Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:00.934302Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:00.934317Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.935559Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:00.966611Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:00.966645Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.973421Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:00.974724Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:00.974746Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:00.977155Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:01.036751Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:01.066199Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:01.085446Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:01.085483Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:01.094894Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:01.098062Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:01.098097Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:01.115866Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:01.116327Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:01.116347Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:01.117824Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:01.127771Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:01.128151Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:01.128159Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:01.129153Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:01.134072Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:01.142044Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:01.147193Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:01.147762Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:01.147773Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:01.149486Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:01.173329Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:01.216952Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:01.332309Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:01.339656Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:01.339699Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:01.361913Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:01.361950Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:01.393688Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:01.395165Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:01.524857Z  INFO local_candidate{attempt=37}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:01.661373Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:01.661416Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:01.718102Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:01.733669Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:01.736151Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:01.749335Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:01.749354Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:01.755863Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:01.757939Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:01.757963Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:01.781453Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:01.782499Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:01.782525Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:01.785980Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:01.798882Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:01.803942Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:01.804575Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:01.804600Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:01.806264Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:01.814624Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:01.821549Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:01.987705Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:02.014214Z  INFO local_candidate{attempt=35}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:02.020988Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:02.046838Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:02.046863Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.076409Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:02.076637Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:02.101018Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:02.101049Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.127831Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:02.127861Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:02.129439Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:02.129469Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:02.130762Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:02.165756Z  INFO local_candidate{attempt=36}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:16:02.181803Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:02.182636Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:02.222639Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:02.222677Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:02.249808Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:16:02.301134Z  INFO local_candidate{attempt=42}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:16:02.314066Z  INFO local_candidate{attempt=32}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:02.379186Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:02.379240Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:02.415949Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:16:02.431475Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:02.431509Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:02.436779Z  INFO local_candidate{attempt=29}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:02.458494Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:02.458539Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:02.485524Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:16:02.488837Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:02.502748Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:02.502809Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:02.506370Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:02.527221Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:02.527244Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.527359Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:02.527375Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.556303Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:02.556322Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:02.557410Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:02.557436Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.561045Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:02.561073Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:02.573384Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:02.582877Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:02.582895Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.599258Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:02.606364Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:02.626358Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:02.626404Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:02.637338Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:16:02.654229Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:02.666487Z  INFO local_candidate{attempt=42}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:02.698768Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:02.714542Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:02.714998Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:02.715007Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.716624Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:02.727557Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:02.727943Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:02.727951Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.729027Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:02.734479Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:02.746119Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:02.748053Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:02.748676Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:02.748688Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.750199Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:02.750860Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:02.758238Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:02.758261Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.774551Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:02.786037Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:02.786084Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:02.799466Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:02.799506Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.817196Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:02.829335Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:02.839497Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:02.843664Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:02.843683Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:02.846941Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:02.874217Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:02.944007Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:16:02.953803Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:02.960813Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:02.960885Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:02.984351Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:02.985022Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:02.985042Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.010387Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:03.010418Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:03.010504Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:03.013978Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:03.034480Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:03.034512Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.037135Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:16:03.038183Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:03.043828Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:03.043849Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.052525Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:03.053996Z  INFO local_candidate{attempt=30}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:03.062452Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:03.067262Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:03.069040Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:03.069831Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:03.076730Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:03.089298Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:03.089661Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:03.089669Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.091640Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:03.099151Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:03.101379Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:03.101722Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:03.101729Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.102711Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:03.107580Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:03.111898Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:03.113064Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:03.113619Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:03.115389Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:03.123540Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:03.139738Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:03.154017Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:03.161692Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:03.162263Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:03.162276Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.163769Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:03.173928Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:03.174304Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:03.174314Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.175789Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:03.180870Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:03.180899Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:03.181141Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:03.181866Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:03.181893Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.191642Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:03.191670Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.191755Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:03.194319Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:03.194829Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:03.194838Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.196810Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:03.197106Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:03.201375Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:03.201395Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.208058Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:03.210537Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:03.220030Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:03.220419Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:03.220428Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.221481Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:03.229300Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:03.240103Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:03.240124Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.245965Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:03.246677Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:03.246689Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.248321Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:03.299468Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:03.306327Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:03.307259Z  INFO local_candidate{attempt=34}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:03.355379Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:03.363798Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:03.369313Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:03.369720Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:03.369730Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.371110Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:03.371147Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:03.380825Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:03.381178Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:03.381186Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.382127Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:03.387134Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:03.388369Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:03.388386Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.396867Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:03.399827Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:03.400335Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:03.400347Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.402347Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:03.407942Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:03.407966Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.417785Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:03.425449Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:03.448713Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:03.448750Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:03.461432Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:03.461458Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.495072Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:03.556343Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:03.582672Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:03.582693Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.589324Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:03.612998Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:03.617724Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:03.617746Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.626881Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:03.653506Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:03.656402Z  INFO local_candidate{attempt=41}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:03.662620Z  INFO local_candidate{attempt=36}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:03.675304Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:03.675797Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:03.675804Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.677047Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:03.679049Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:03.680267Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:03.680280Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.683193Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:03.738478Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:03.740759Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:03.740777Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.743157Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:03.749176Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:03.776659Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:03.776688Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.785825Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:03.785857Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:03.787642Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:03.787670Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:03.811488Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:03.820740Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:03.831571Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:03.833286Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:03.833310Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:03.833787Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:03.833795Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.835006Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:03.845942Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:03.845962Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.875868Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:03.888372Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:03.890707Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:03.890724Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.893371Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:03.959746Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:03.972863Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:03.972887Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:03.978895Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:03.998117Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:03.998733Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:03.998746Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.001020Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:04.012008Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:04.012462Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:04.012472Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.013555Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:04.018618Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:04.022870Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:04.106603Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:04.110021Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:04.110054Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:04.127116Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:04.127149Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.146117Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:04.151354Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:04.152222Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:04.155703Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:04.160360Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:04.163648Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:04.177866Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:04.177885Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.178065Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:04.178484Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:04.178499Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.180513Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:04.188122Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:04.188152Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.191063Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:04.191497Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:04.191510Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.192562Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:04.197911Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:04.202572Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:04.203861Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:04.204467Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:04.208337Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:04.214764Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:04.221290Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:04.256597Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:04.272558Z  INFO local_candidate{attempt=32}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:16:04.281743Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:04.288264Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:04.292813Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:04.292834Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.300845Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:04.301385Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:04.301402Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.314608Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:04.314854Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:04.315031Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:04.315040Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.316150Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:04.321967Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:04.321987Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.323544Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:04.330276Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:04.330313Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:04.333295Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:04.350930Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:04.352374Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:04.352396Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.354033Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:04.354113Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:04.354665Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:04.354686Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.357036Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:04.363887Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:16:04.371818Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:04.372250Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:04.372262Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.373235Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:04.378120Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:04.382349Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:04.383517Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:04.384049Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:04.394077Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:04.413238Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:04.427735Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:04.442879Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:04.442912Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.454747Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:04.459091Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:04.459108Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.466128Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:04.474642Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:04.475633Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:04.475654Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.478350Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:04.479018Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:04.479445Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:04.479456Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.480546Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:04.481102Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:04.496298Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:04.504216Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:04.505054Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:04.505065Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.506117Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:04.507034Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:04.507254Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:04.507275Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.509678Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:04.545488Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:04.545521Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.568057Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:04.570463Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:04.570478Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.572951Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:04.592879Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:04.603103Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:04.618970Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:04.627715Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:04.627748Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.652411Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:04.671671Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:04.684229Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:04.684258Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.684368Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:04.684384Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.704479Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:04.777474Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:04.784851Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:04.784883Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.789950Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:04.793295Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:04.800956Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:04.805276Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:04.822221Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:16:04.822251Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:04.823494Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:16:04.833631Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:04.837033Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:04.837059Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.841037Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:04.841114Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:04.841939Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:04.841954Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.844347Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:04.862302Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:04.863007Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:04.863024Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.866314Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:04.880910Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:04.881377Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:04.881388Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.882682Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:04.888859Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:04.892122Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:04.894024Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:04.895477Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:04.896143Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:04.907324Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:04.958573Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:04.958609Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:04.963599Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:16:04.971036Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:04.974197Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:04.978641Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:04.978657Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.978818Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:04.986222Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:04.990628Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:04.990646Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:04.999812Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:05.000246Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:05.000255Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.001470Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:05.003649Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:05.015256Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:05.033721Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:05.035344Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:05.035373Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.038142Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:05.045806Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:05.050824Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:05.050853Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.059020Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:05.059048Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.061292Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:05.062625Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:05.062651Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.065439Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:05.067036Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:05.067054Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.073991Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:05.083249Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:05.083922Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:05.084474Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:05.084484Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.086232Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:05.088098Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:05.089989Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:05.096589Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:05.096972Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:05.096979Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.097991Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:05.102855Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:05.106990Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:05.107388Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:05.144084Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:05.187683Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:05.188568Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:05.188582Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.190870Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:05.206497Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:05.223784Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:05.223816Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.232540Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:05.251683Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:05.252237Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:05.252250Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.254122Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:05.264707Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:05.265099Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:05.265107Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.266152Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:05.271029Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:05.275143Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:05.278928Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:05.280659Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:05.294306Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:05.300262Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:05.300284Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.307517Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:05.317004Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:05.318818Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:05.353112Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:05.353354Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:05.353374Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.390266Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:05.423671Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:05.423764Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.441723Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:05.506868Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:05.506896Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.524855Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:05.557791Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:05.573751Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-12T18:16:05.573785Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:05.575994Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:05.601700Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:05.607385Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:05.607417Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.636846Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:05.641252Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:05.645529Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:05.646427Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:05.646439Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.649732Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:05.697435Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:05.697471Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:05.717499Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:05.717533Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.720410Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:16:05.812584Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:05.823251Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:05.837224Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:05.837248Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.838786Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:05.838816Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:05.844517Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:05.852745Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:05.859987Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:05.860865Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:05.860880Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.863286Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:05.864988Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:05.865017Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:05.866596Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:05.867387Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:05.867399Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.869910Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:05.872346Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:16:05.875823Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:05.882477Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:05.882935Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:05.882944Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.884126Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:05.892411Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:05.900058Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:05.923679Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:05.949973Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:05.950007Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:05.969707Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:05.969743Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:05.972136Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:16:05.990172Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:05.990220Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:05.991257Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:05.991284Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.003521Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:06.017705Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:16:06.081834Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:06.081871Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:06.095469Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:06.096212Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:06.147511Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:06.149064Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:06.149095Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.153005Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:06.165276Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:06.172007Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:06.172042Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:06.180041Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:16:06.233116Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:06.233146Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.330026Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:06.338970Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:06.360134Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:06.368683Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:06.368713Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.382832Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:06.386223Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:06.387370Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:06.387384Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.389917Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:06.397666Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:06.397696Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.447968Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:06.459805Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:06.481078Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:06.481796Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:06.481811Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.483701Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:06.502051Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:06.502757Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:06.502779Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.504639Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:06.525628Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:06.525661Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.573365Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:06.630217Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:06.675466Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:06.676330Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:06.676343Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.678730Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:06.713529Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:06.778123Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:06.778156Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.823463Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:06.866976Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:06.885450Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:06.885476Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.886199Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:06.897438Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:06.911188Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:06.911234Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.914835Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:06.929187Z  INFO local_candidate{attempt=31}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:06.930385Z  INFO local_candidate{attempt=31}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:06.930405Z  INFO local_candidate{attempt=31}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.931483Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:06.932319Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:06.932332Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.932548Z  INFO local_candidate{attempt=31}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:06.934456Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:06.940930Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:06.940959Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:06.956401Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:06.956425Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:06.965245Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:06.976380Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:06.989737Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:06.991224Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:06.991242Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.006325Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:07.006869Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:07.006877Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.008293Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:07.022379Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:07.045296Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:07.045871Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:07.045880Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.047350Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:07.071162Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:07.095948Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:07.107788Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:07.107823Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:07.111586Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:07.132483Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:07.133683Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:07.133698Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.136498Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:07.139932Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:07.146962Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:07.159342Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:07.159746Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:07.159755Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.161379Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:07.171515Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:07.171859Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:07.171866Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.172743Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:07.178182Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:07.182921Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:07.184196Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:07.184820Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:07.194663Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:07.259337Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:07.263593Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:07.263614Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.271127Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:07.284569Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:07.284985Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:07.284994Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.286025Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:07.313099Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:07.313913Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:07.313926Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.315704Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:07.485509Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:07.508884Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:07.508913Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.523219Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:07.662180Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:07.662233Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:07.678962Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:07.786926Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:07.810956Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:07.810985Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.825333Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:07.848860Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:07.848917Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:07.874436Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:07.876603Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:07.876618Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.879770Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:07.943858Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:07.994535Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:07.995584Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:07.995598Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:07.997894Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:08.058929Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:08.072934Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:08.072957Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.080640Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:08.102903Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:08.103612Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:08.103626Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.106065Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:08.115887Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:08.118358Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:08.118821Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:08.118829Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.119971Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:08.125773Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:08.130525Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:08.180408Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:08.180450Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.218742Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:08.218777Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:08.227710Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:08.242617Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:16:08.273068Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:08.273110Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.280345Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:08.317013Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:08.373979Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:08.395323Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:08.395347Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.410519Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:08.415543Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:08.415578Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:08.422920Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:16:08.461430Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:08.463714Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:08.463732Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.466475Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:08.533160Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5710 paired_horizon=11269 use_paired=false
2026-09-12T18:16:08.535983Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:08.542988Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:08.543019Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:08.556044Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:08.560042Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:08.560071Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.590067Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:08.591630Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:08.591653Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:08.603077Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:08.619548Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:16:08.633341Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:08.640660Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:08.652695Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:08.653103Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:08.653113Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.654602Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:08.663980Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:08.664370Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:08.664380Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.665382Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:08.667701Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:08.667728Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.670282Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:08.674469Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:08.675659Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:08.676225Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:08.685443Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:08.755765Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:08.760322Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:08.760345Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.767086Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:08.767217Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:08.779536Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:08.779959Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:08.779968Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.781072Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:08.805815Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:08.806613Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:08.806624Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:08.808053Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:08.845406Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:08.906614Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:08.906639Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:09.004128Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:09.120523Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:09.120563Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:09.130026Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:09.153798Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:09.153820Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:09.154593Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:09.195599Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:09.208831Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:09.208868Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:09.285773Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:09.291917Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:09.334914Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:09.336104Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:09.336121Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:09.338716Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:09.349235Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:09.349580Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:09.349590Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:09.350473Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:09.353109Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:09.353128Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:09.355657Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:09.368467Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:09.368944Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:09.368955Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:09.370602Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:09.451061Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:09.463418Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:09.463452Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:09.466768Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:09.481077Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:09.481113Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:09.488079Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:09.506495Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:09.507076Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:09.507094Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:09.509278Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:09.520109Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:09.520528Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:09.520540Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:09.521479Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:09.526287Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:09.530520Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:09.554646Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:09.617060Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:09.618230Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:09.618247Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:09.620606Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:09.932969Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:09.981418Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:09.993784Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:09.993859Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.051753Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:10.051786Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.090155Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:10.100993Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:10.104655Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:10.125489Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:10.125512Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.129499Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:10.139868Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:10.139899Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:10.148744Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:10.151059Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:10.173744Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:10.182901Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:10.182936Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:10.197754Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:10.197788Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:10.213720Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:10.213743Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.219151Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:10.219182Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.232103Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:10.263083Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:10.284357Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:10.290631Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:10.290660Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.295596Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:10.305698Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:10.316970Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:10.319321Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:10.324788Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:10.348000Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:10.364999Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:10.365037Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.393656Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:10.393691Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.398016Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:10.398049Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.403803Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:10.405652Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:10.435877Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:10.435911Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.479808Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:10.484398Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:10.487702Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:10.499616Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:10.500255Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:10.500272Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.502625Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:10.561260Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:10.567798Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:10.567822Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.579287Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:10.593120Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:10.604245Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:16:10.604269Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:10.605318Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:16:10.607176Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:10.674696Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:10.675447Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:10.676286Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:10.676307Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:10.678650Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:16:10.740119Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:10.740143Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.740504Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:10.740524Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.791187Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:10.843869Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:10.919436Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:10.954009Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:10.954030Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:10.992908Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:10.997352Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:11.051094Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:11.051123Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.117513Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:11.137245Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:11.142347Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:11.149928Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:11.158810Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:11.164278Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:11.164308Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.169608Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:11.169630Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.173698Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:11.174122Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:11.174130Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.175595Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:11.185852Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:11.186240Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:11.186248Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.187270Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:11.189003Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:11.192706Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:11.202951Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:11.209762Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:11.210986Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:11.211038Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.214371Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:11.220695Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:11.220736Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.277367Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:11.330366Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:11.336519Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:11.341013Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:11.341785Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:11.341804Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.347400Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:11.366571Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:11.366594Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.375882Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:11.375913Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:11.385770Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:11.402841Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:16:11.403570Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:11.408343Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:11.408383Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.423830Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:11.423892Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.466175Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:11.469936Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:11.492945Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:11.493523Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:11.493533Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.494855Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:11.544910Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:11.551195Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:16:11.551241Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:11.563022Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:16:11.727091Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:11.760687Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:11.760710Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:11.797416Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:11.899803Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:11.968891Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:11.968915Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.020793Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:12.098049Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:12.098083Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:12.129860Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:12.192133Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:12.219142Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:12.219166Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.262417Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:12.299186Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:12.300660Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:12.300676Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.303520Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:12.404009Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:12.450784Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:12.498241Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:12.521007Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:12.521043Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.523441Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:12.523468Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.545130Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:12.545161Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.575867Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:12.578869Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:12.600410Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:12.600445Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:12.603406Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:12.611845Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:12.617014Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:12.625336Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:12.625758Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:12.625766Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.627813Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:12.635829Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:12.635858Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:12.638076Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:12.638463Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:12.638472Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.639486Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:12.644653Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:12.649151Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:12.650390Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:12.650953Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:12.673295Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:12.674787Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:12.679285Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:12.684796Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:12.689372Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:12.689389Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.696760Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:12.709899Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:12.710335Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:12.710355Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.711536Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:12.739075Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:12.739904Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:12.739916Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.741723Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:12.746354Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:12.746373Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:12.748991Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=27 tile=1452 row_words=15 horizon=3578
2026-09-12T18:16:12.825719Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:12.827242Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:12.827278Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:12.859791Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:12.862322Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:12.864362Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:12.867008Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:12.868162Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:12.868180Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.875136Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:12.884771Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:12.889831Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:12.891817Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:12.893028Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:12.893061Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.894681Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:12.894706Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.903263Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:12.903280Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.908306Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:12.913562Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:12.948766Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:12.949833Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:12.970861Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:12.973562Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:12.973593Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.978543Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:12.978571Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:12.979129Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:13.046342Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:13.195903Z  INFO local_candidate{attempt=32}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:13.243063Z  INFO local_candidate{attempt=36}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:13.245799Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:13.245827Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.275262Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:13.281928Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:13.310268Z  INFO local_candidate{attempt=36}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:13.310292Z  INFO local_candidate{attempt=36}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.311842Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:13.311867Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.335713Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:13.335748Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:13.349081Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:13.362602Z  INFO local_candidate{attempt=36}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:13.367860Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:16:13.390179Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:13.390235Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:13.426799Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:13.481866Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:13.481905Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:13.485813Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:13.487923Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:13.494578Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:13.499605Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:13.499635Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.503260Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:13.503286Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:13.506937Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:13.509191Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:13.509655Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:13.509666Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.510668Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:13.511976Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:13.512000Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.516089Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:13.521709Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:13.521732Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:13.529263Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:13.529595Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:16:13.529816Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:13.529825Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.530117Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:13.530837Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:13.530857Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.531764Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:13.533680Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:13.538010Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:13.547482Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:13.547938Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:13.547950Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.548629Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:13.549113Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:13.554940Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:13.560062Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:13.569762Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:13.595308Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:13.595336Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.626449Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:13.678078Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:13.695517Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:13.703645Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:13.703670Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.708584Z  INFO local_candidate{attempt=29}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:16:13.735409Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:13.743829Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:13.743863Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.766513Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:13.766549Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:13.778292Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:13.803456Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:16:13.804140Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:13.809822Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:13.809849Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.817014Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:13.822786Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:13.822816Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:13.827178Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:13.828721Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:16:13.832062Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:13.833988Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:13.955372Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:13.979516Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:13.979538Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:13.991744Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:13.991778Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:14.003636Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:14.003874Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:14.040942Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:14.041902Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:14.068956Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:14.068995Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:14.083909Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:14.083940Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:14.098728Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:14.124234Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:14.133621Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:14.144824Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:14.144845Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:14.158176Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:14.160624Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:14.163420Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:14.163440Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:14.169187Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:14.244702Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:14.249965Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:14.249987Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:14.256283Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:14.474612Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:14.474648Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:14.557597Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:14.568179Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:16:14.600575Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:14.600599Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:14.641768Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:14.648266Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:14.648717Z  INFO local_candidate{attempt=37}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:14.674299Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:14.674322Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:14.685902Z  INFO local_candidate{attempt=37}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:14.685927Z  INFO local_candidate{attempt=37}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:14.705754Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:14.721726Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:14.723890Z  INFO local_candidate{attempt=37}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:14.757520Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:14.757543Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:14.769571Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=28 success=true
2026-09-12T18:16:14.772626Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:16:14.778928Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:14.795159Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:14.856357Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:14.856396Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:14.874116Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:14.874150Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:14.879267Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:14.879297Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:14.887377Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:14.904718Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:16:14.948988Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:16:14.990065Z  INFO local_candidate{attempt=34}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:16:15.048081Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:15.048108Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:15.048130Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:15.048149Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:15.055792Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:16:15.082870Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:16:15.091851Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:15.107075Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:15.107110Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:15.113742Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:15.113773Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:15.120119Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:15.120138Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.140738Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:16:15.140774Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:15.142980Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:15.152192Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:15.155693Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:15.169793Z  INFO local_candidate{attempt=37}: exchange table and repeat patch storage exchange_table_bytes=28020 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:16:15.177073Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:15.177538Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:15.177547Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.178702Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:15.222014Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:15.257694Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:15.257718Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.278216Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:16:15.313566Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:15.351057Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:15.352395Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:15.352411Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.355272Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:15.393451Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:15.404163Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:15.404188Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.421710Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:15.433986Z  INFO local_candidate{attempt=29}: compared ordinary and paired exchange schedules phase=22 candidates=18 ordinary_horizon=2545 paired_horizon=2362 use_paired=false
2026-09-12T18:16:15.443028Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:15.443050Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:15.446493Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:15.474686Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:15.474722Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:15.501255Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:16:15.543025Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:15.602703Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:15.602738Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.606761Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:15.606795Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:15.638761Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:15.651269Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:15.651300Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:15.658834Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:16:15.669652Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:15.697765Z  INFO local_candidate{attempt=29}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:15.708580Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:15.723043Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:15.723467Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:15.723485Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.723800Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:15.723817Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.724973Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:15.744934Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:15.747254Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:15.748287Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:15.748303Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.750700Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:15.756748Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:15.769311Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:15.773331Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:15.774021Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:15.774037Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.774353Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:15.774366Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.776738Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:15.802346Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:15.802369Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.810896Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:15.835116Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:15.835945Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:15.835967Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.837827Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:15.848835Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:15.898672Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:15.901482Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:15.901510Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.904199Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:15.919991Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:15.946597Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:15.946632Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:15.971720Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:16.113883Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:16.118936Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:16.118957Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.124791Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:16.153423Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:16.153458Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:16.182775Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:16:16.220636Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:16.220674Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:16.269430Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:16.291807Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:16.291835Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.301408Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=30 tile=707 row_words=441 horizon=14541
2026-09-12T18:16:16.304718Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:16.326189Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:16:16.326234Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:16.338589Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:16:16.364636Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:16.367061Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:16.367077Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.368610Z  INFO local_candidate{attempt=29}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:16:16.369654Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:16.387530Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:16.403032Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:16:16.403057Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:16.413502Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:16:16.429467Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:16.429509Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.473054Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:16.532137Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:16.532175Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:16.613865Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:16.667038Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:16.706899Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:16.706934Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.743960Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:16.768087Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:16.768606Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:16.768621Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.770321Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:16.781379Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:16.800723Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:16.802772Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:16.802791Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.815606Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:16.823493Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:16.825732Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:16.825745Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.828597Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:16.837400Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:16.840615Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:16.840644Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.874158Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:16.874183Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.890418Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:16.920479Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:16.921353Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:16.921380Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:16.923453Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:16.923606Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:16.970795Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=29 success=true
2026-09-12T18:16:16.973872Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:16:16.980621Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:17.002580Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:17.002614Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.015665Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:17.035077Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:17.086509Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:17.086542Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.121656Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:17.174126Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:17.183168Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:17.183215Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.197136Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:17.209560Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:16:17.216740Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:17.216762Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.217080Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:17.217098Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.229477Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:17.249589Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:17.264390Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:17.264426Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.323022Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:17.323859Z  INFO local_candidate{attempt=38}: exchange table and repeat patch storage exchange_table_bytes=28020 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:16:17.334281Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:17.334303Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.345494Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:17.351804Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:17.363917Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:17.363949Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.374463Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:16:17.405020Z  INFO local_candidate{attempt=30}: compared ordinary and paired exchange schedules phase=22 candidates=18 ordinary_horizon=2545 paired_horizon=2330 use_paired=false
2026-09-12T18:16:17.412512Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:17.412541Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.415453Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:17.441310Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:17.441342Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.453964Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:17.459681Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:17.470126Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:17.470145Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.487544Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:17.607996Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:17.627411Z  INFO local_candidate{attempt=34}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:17.643666Z  INFO local_candidate{attempt=41}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5710 paired_horizon=11269 use_paired=false
2026-09-12T18:16:17.655919Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:17.655955Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.688051Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:17.688838Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:17.692015Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:17.695170Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:16:17.702645Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:17.702662Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.708775Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:17.708802Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.718970Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:17.718991Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.720813Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:17.723668Z  INFO local_candidate{attempt=34}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:17.723690Z  INFO local_candidate{attempt=34}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.737524Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:16:17.738792Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:17.739274Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:17.739283Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.740672Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:17.759507Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:17.762869Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:17.764018Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:17.764032Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.764673Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:17.764697Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.766449Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:17.785043Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:17.785598Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:17.785607Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.786996Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:17.790828Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:16:17.850645Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=767 success=true
2026-09-12T18:16:17.850690Z  INFO local_candidate{attempt=37}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=28020 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:16:17.850704Z  INFO local_candidate{attempt=37}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28020 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:17.873059Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:17.873094Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.885100Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:17.893043Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:17.893075Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.895569Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:16:17.899695Z  INFO local_candidate{attempt=34}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:17.904590Z  INFO local_candidate{attempt=35}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:16:17.930516Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:17.940768Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:17.940793Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.943781Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:16:17.963510Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:17.963538Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:17.969625Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:17.969653Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:17.998732Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:16:18.015662Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:18.044021Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:18.044058Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:18.075829Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:18.171503Z  INFO local_candidate{attempt=29}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:18.171540Z  INFO local_candidate{attempt=29}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:18.186822Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:18.206576Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:18.206599Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.218577Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:18.229180Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:18.229227Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:18.242436Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:18.249415Z  INFO local_candidate{attempt=29}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:18.296254Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:18.328063Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:18.328105Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.361094Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:18.388425Z  INFO local_candidate{attempt=30}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:16:18.403454Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:18.403490Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:18.419855Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:18.425551Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:16:18.425583Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:18.436912Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:16:18.478408Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=627 success=true
2026-09-12T18:16:18.481177Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:18.493096Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:18.493471Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:18.493675Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:18.493980Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:18.493990Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.495185Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:18.499257Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:18.500240Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:18.500259Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.502563Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:18.504543Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:18.512761Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:18.513574Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:18.513596Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.516093Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:18.524911Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:18.525644Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:18.525657Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.527612Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:18.535084Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:18.535765Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:18.535787Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.537604Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:18.546469Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:18.554105Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:18.556075Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:18.556938Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:18.566027Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:18.571008Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:18.571029Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.578415Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:18.580825Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:18.591088Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:18.591482Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:18.591492Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.592548Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:18.617663Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:18.618470Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:18.618483Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.620191Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:18.630832Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:18.631243Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:18.631253Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.632340Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:18.637516Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:18.641696Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:18.647431Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:18.656570Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:18.656605Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.667155Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:18.681566Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:18.687601Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:18.689816Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:18.689832Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.692508Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:18.697687Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:18.698104Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:16:18.698113Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.699004Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:16:18.704155Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:18.795900Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:18.822849Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:18.822906Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.827607Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:18.856745Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:18.856782Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.857424Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:18.872603Z  INFO local_candidate{attempt=30}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:18.889326Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:18.901968Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:18.901991Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.915865Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:18.916548Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:18.916563Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.918563Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:18.935373Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:18.941453Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:18.942477Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:16:18.942491Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.944986Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:16:18.961107Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:18.961807Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:16:18.961816Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:18.963437Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:16:19.003580Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:19.014464Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:19.112746Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:19.112784Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:19.167398Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:19.184907Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:19.195551Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:19.195590Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.228877Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:16:19.232225Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:19.232442Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:19.245613Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:19.245642Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.255277Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:19.275827Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:19.275865Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.286780Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:19.289729Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:19.291161Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:19.291245Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.294158Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:19.304508Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:19.314464Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:19.314489Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.317097Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:19.317121Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.323264Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:19.345494Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:19.423250Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:19.431579Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:19.431611Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.438857Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:19.452234Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:19.501713Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:19.502630Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:19.502645Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.504726Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:19.510898Z  INFO local_candidate{attempt=35}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:19.513357Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:19.520797Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:19.520814Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.531712Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:19.617179Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:19.617227Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.785371Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:19.809004Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:19.827834Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:19.827857Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.836878Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:19.849770Z  INFO local_candidate{attempt=30}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:16:19.850543Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:19.850980Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:19.850989Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.852604Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:19.856716Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:19.902081Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:19.915698Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:19.915739Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:19.919215Z  INFO local_candidate{attempt=32}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:19.919247Z  INFO local_candidate{attempt=32}: optimized physical exchange schedule phase=13 initial_horizon=12868 selected_horizon=12868 endpoint_lower_bound=11940 lower_bound_gap=928 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:19.928768Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:16:19.928801Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:19.949805Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:16:19.961759Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:19.961789Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:19.968401Z  INFO local_candidate{attempt=32}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-12T18:16:20.010183Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:20.015800Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:20.018097Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:20.018116Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:20.020705Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:20.109084Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:16:20.223236Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:20.224975Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:20.225639Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:20.225652Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:20.227589Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:20.246722Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:20.262387Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:20.262411Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:20.286840Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:20.286864Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:20.303121Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:20.331470Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:20.332654Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:20.343541Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:20.343561Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:20.369733Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:20.392722Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:20.399413Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:20.400817Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:20.400842Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:20.403916Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:20.415059Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:20.415083Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:20.416565Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:20.429026Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:20.446903Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:20.446930Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:20.468480Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:20.475468Z  INFO local_candidate{attempt=35}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:20.475501Z  INFO local_candidate{attempt=35}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:20.483988Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:20.521690Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:20.521726Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:20.537629Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:20.537669Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:20.540771Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:20.540800Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:20.551037Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:16:20.556041Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:20.564034Z  INFO local_candidate{attempt=35}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:20.579363Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:16:20.588095Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:20.588409Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:20.598857Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:16:20.873843Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:20.910789Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:20.910881Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:20.950978Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:21.073844Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:21.073885Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:21.107573Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:21.107787Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:21.141004Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:21.141034Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:21.182775Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:21.244686Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:21.302991Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:21.303039Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:21.370267Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:21.411850Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:21.469575Z  INFO local_candidate{attempt=30}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:21.469613Z  INFO local_candidate{attempt=30}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:21.486372Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:21.486405Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:21.538423Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:21.545887Z  INFO local_candidate{attempt=30}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:21.563507Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:21.563542Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:21.564108Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:21.652278Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:21.669779Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:21.669810Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:21.766260Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:21.829482Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:21.830045Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:21.830071Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:21.861077Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:21.914554Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:21.927539Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:21.931820Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:21.931845Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:21.953700Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:21.953734Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:21.955841Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:21.955861Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:21.986147Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:21.993776Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:22.032824Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:22.086586Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=28 success=true
2026-09-12T18:16:22.089670Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:16:22.095537Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:22.201469Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:22.206238Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:22.206592Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:22.209472Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:22.210647Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:22.211123Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:22.211586Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:22.211646Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:22.211655Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.212174Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:22.212804Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:22.212897Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:22.213459Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:22.216242Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:22.217147Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:22.217162Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.218312Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:22.218409Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:22.219167Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:22.219193Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:22.219299Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:16:22.219311Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.219494Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:22.219542Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:22.220028Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:22.220037Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.220302Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:22.221287Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:16:22.221300Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.221425Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:16:22.222105Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:22.223776Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:16:22.232119Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:22.232620Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:22.232641Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:22.232650Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.233390Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:22.233791Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:22.233803Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.234484Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:22.234905Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:22.256946Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:22.270925Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:22.270952Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.270988Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:22.271406Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:22.271418Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.272425Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:22.273287Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:22.276362Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:22.281315Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:22.281329Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.288675Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:22.295370Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:22.296438Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:22.296826Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:22.296835Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.297801Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:22.301806Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:22.302255Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:22.302267Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.303375Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:22.308603Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:22.313082Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:22.324104Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:22.324994Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:22.325014Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.326878Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:22.352717Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:22.353462Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:22.353476Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.354676Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:22.355408Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:22.360101Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:22.360119Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.363335Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:22.363556Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:22.364310Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:22.364332Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.365830Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:22.365850Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.367040Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:22.367194Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:22.367461Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:22.370120Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:22.377062Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:22.382008Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:22.383904Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:22.403144Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:22.403548Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:22.403558Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.404714Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:22.409957Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:22.411052Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:22.411066Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.413675Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:22.430165Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:22.432025Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:22.432038Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.433847Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:22.434256Z  INFO local_candidate{attempt=39}: exchange table and repeat patch storage exchange_table_bytes=28020 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:16:22.444779Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:22.454641Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:22.454662Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.468594Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:22.607364Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:22.607397Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:22.624056Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:16:22.627225Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:22.632626Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:22.632645Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.638622Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:22.726334Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:22.749531Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:22.749559Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.779282Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:22.820190Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:22.836904Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:22.846670Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:22.846696Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.854384Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:22.854405Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.864670Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:22.869045Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:22.869075Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:22.872081Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:22.896033Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:16:22.927347Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:22.940824Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:22.940846Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:22.947693Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:22.987689Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:22.996633Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:22.996662Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:23.011643Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:23.013120Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:23.035295Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:23.035316Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:23.046718Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:23.062919Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:23.062947Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:23.063899Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:23.074598Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:23.104016Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:23.105307Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:23.105321Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:23.107478Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:23.127537Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:16:23.189576Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:23.189612Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:23.215825Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:16:23.223633Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:23.243169Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:23.243191Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:23.274366Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:23.500224Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:23.519643Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:23.519666Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:23.533150Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:23.831105Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:23.831143Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:23.905878Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:16:23.927367Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:23.927652Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=4572 success=true
2026-09-12T18:16:23.927672Z  INFO local_candidate{attempt=38}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=28020 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:16:23.927742Z  INFO local_candidate{attempt=38}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28020 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:23.968619Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:23.968659Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.009386Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:24.032006Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:24.051521Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:24.051545Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.062432Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:24.083039Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:24.094366Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:24.094387Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.130383Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:24.279841Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:24.298320Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:24.298360Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:24.307563Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:16:24.319422Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:24.319467Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:24.357836Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:16:24.420092Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:24.420126Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.423092Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=53 success=true
2026-09-12T18:16:24.423126Z  INFO local_candidate{attempt=39}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=28020 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:16:24.423139Z  INFO local_candidate{attempt=39}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28020 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:24.448585Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=520 success=true
2026-09-12T18:16:24.453103Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:24.461326Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:24.462349Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:24.462873Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:24.462883Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.464012Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:24.468361Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:24.469247Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:24.469264Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.469277Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:24.470059Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:24.470799Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:24.470815Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.471241Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:24.471832Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:24.472907Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:24.473520Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:24.473905Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:24.473914Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.474786Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:24.475426Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:24.475859Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:16:24.475872Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.478356Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:16:24.484658Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:24.485006Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:24.485014Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.485941Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:24.490666Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:24.493858Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:24.494501Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:16:24.494511Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.494913Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:24.496022Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:24.496045Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:24.496084Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:16:24.496625Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:24.508875Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:24.544828Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:24.555755Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:24.557958Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:24.557974Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.560290Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:24.574052Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:24.578282Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:24.578298Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.583476Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:24.585285Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:24.592644Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:24.598419Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:24.602451Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:24.603054Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:24.603070Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.604703Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:24.605313Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:24.605330Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.611696Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:24.620903Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:24.630399Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:24.630752Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:16:24.630760Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.631524Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:16:24.632188Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:24.632977Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:24.632992Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.634806Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:24.635924Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:24.646562Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:24.646971Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:24.646978Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.648218Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:24.648843Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=36 success=true
2026-09-12T18:16:24.651935Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:16:24.659307Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:24.667110Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:24.667137Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.755797Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:24.780021Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:24.780045Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.783350Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:24.808147Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:24.948370Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:24.980837Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:24.980862Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:24.984357Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:25.001456Z  INFO local_candidate{attempt=29}: exchange table and repeat patch storage exchange_table_bytes=27400 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:16:25.003667Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:25.003690Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.024131Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:25.028484Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:25.062799Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:25.072727Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:25.072764Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:25.096825Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:16:25.098125Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:25.098158Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.135796Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:25.185750Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:25.185788Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:25.193484Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:16:25.202327Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:25.219055Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:25.219086Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.228533Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:25.248939Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:25.249618Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:25.249633Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.251652Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:25.266151Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:25.266782Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:25.266801Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.268343Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:25.276145Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:25.283986Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:25.292876Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:25.300781Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:25.300816Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.307311Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:25.349760Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:25.352386Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:25.352419Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.356821Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:25.382890Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:25.383911Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:25.383926Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.386267Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:25.388031Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=964 success=true
2026-09-12T18:16:25.457756Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:25.489449Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:25.489490Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.537144Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:25.538876Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:25.567980Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:25.568007Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.578369Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:25.578416Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:25.586957Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:25.595354Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:16:25.601108Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:25.601524Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:25.601536Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.602957Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:25.611807Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:25.634631Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:25.635134Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:25.635143Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.636465Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:25.683864Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:25.699025Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:25.713561Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:25.723374Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:25.723422Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.748109Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:25.748144Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.758873Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:25.783569Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:25.789103Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:25.790076Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:25.790092Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.793022Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:25.845459Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:25.861184Z  INFO local_candidate{attempt=33}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:16:25.866377Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:25.866400Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.886128Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:25.905682Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:25.916530Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:25.916554Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:25.933529Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:25.935923Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:25.935959Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:25.973190Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:16:26.201394Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:26.219245Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:26.219279Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.229694Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:26.256912Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:26.258054Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:26.258067Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.260083Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:26.270681Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:26.311349Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:26.311377Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.354484Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:26.366987Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:26.404506Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:26.404536Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.432608Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:26.438397Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:26.452559Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:26.456323Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:26.456357Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.478802Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:26.478838Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:26.479693Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:26.491236Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:26.491277Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.496941Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:26.508904Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:26.518760Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:26.522105Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:26.522135Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.525443Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:26.537942Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:26.537977Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:26.545878Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:26.545908Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.561783Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:16:26.565051Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:16:26.652954Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:26.658865Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:26.658890Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.664644Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:26.712684Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:26.712721Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:26.713375Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:26.720488Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:16:26.851917Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:26.851956Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:26.865970Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:16:26.902905Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:26.904163Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:26.904184Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.907326Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:26.945944Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:26.952378Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:26.960413Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:26.973964Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:26.987424Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:26.987460Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:26.996073Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:26.996103Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.010759Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:27.014155Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:27.014184Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.026883Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:27.026931Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.032137Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:27.055799Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:27.056372Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:27.056386Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.057688Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:27.065769Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:27.073609Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:27.075896Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:27.075912Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.078544Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:27.116716Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:27.168689Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:27.170214Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:27.170241Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.174134Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:27.194969Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:27.317458Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:27.337071Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:27.337107Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:27.374010Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:27.386575Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:27.405582Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:27.416954Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:27.416977Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.419036Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:27.419073Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.424040Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:27.424069Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.428825Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:27.428853Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:27.432736Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:27.434099Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:16:27.434115Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.434237Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:27.436946Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:16:27.462786Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:27.463650Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:16:27.463662Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.465521Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:16:27.469837Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:27.487719Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:27.494560Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:27.497511Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:27.498970Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:27.512869Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:27.512894Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.514910Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:27.525600Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:27.525949Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:27.525964Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.542014Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:27.557238Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:27.560517Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:27.568477Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:27.578313Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:27.588128Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:27.588784Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:27.588805Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.588823Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:27.591713Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:27.596571Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:27.598561Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:27.599367Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:27.606917Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:27.607330Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:27.607341Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.608426Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:27.610707Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:27.611315Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:27.615661Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:27.615997Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:27.616006Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.616855Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:27.621450Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:27.632769Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:27.633216Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:27.633228Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.634745Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:27.644749Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:27.645265Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:27.645278Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.646959Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:27.647235Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:27.650918Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:27.650938Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.656336Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:27.656364Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.657592Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:27.673197Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:27.673243Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.680566Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:27.687261Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:27.688038Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:27.688052Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.689665Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:27.689732Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:27.693727Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:27.694151Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:27.694166Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.695857Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:27.721339Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:27.725319Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:27.729231Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:27.734723Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:27.735248Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:27.735268Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.736589Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:27.741111Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:27.741482Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:16:27.741491Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.742179Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:16:27.743684Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:27.749095Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:27.751917Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:27.752650Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:27.752669Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.755624Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:27.759448Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:27.793642Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:27.793675Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.829386Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:27.861087Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:27.866540Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:27.866560Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:27.873014Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:28.110358Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:28.171005Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:28.171072Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:28.261755Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:28.283753Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:28.300436Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:28.310113Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:28.310137Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:28.313885Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:28.313904Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:28.320405Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:28.340645Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:28.601983Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:28.602023Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:28.650553Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:28.689484Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:16:28.691703Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:28.691724Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:28.698373Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:16:28.724936Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:28.753459Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:28.753490Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:28.755286Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:28.779146Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:16:28.844717Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:28.844752Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.006415Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:29.189527Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:29.217408Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:29.217431Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.255599Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:29.266503Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=2268 success=true
2026-09-12T18:16:29.266527Z  INFO local_candidate{attempt=29}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10068 exchange_table_bytes=27400 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:16:29.266666Z  INFO local_candidate{attempt=29}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27400 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10068 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:29.550518Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:29.565295Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:29.625221Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:29.625277Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.631640Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:29.631672Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:29.659123Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:29.659156Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.662885Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:29.718695Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:29.719315Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:29.789807Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=523 success=true
2026-09-12T18:16:29.796097Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:29.803235Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:29.803772Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:29.803780Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.805153Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:29.805267Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:29.816895Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:29.817278Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:29.817289Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.818862Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:29.824664Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:29.825793Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:16:29.825808Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.828091Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:16:29.828384Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:29.828734Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:29.828741Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.829741Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:29.834732Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:29.837367Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:29.839227Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:29.840414Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:29.840989Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:29.843280Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:29.843928Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:16:29.843936Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.845431Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:16:29.848840Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:29.849155Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:29.849181Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.850301Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:29.850898Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:29.855269Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:29.868277Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:29.868727Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:29.868737Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.870523Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:29.897675Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:29.906583Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:29.907907Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:29.911255Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:29.911271Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.917452Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:29.929675Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:29.930050Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:29.930058Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.931145Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:29.955417Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:29.956151Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:29.956162Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:29.957530Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:30.022224Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:16:30.089656Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:30.089688Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:30.107095Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:30.117342Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:16:30.124723Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:30.124750Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.141286Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:30.155863Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:30.158507Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:30.283821Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:30.289861Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:30.289884Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.296924Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:30.306499Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:30.351000Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:30.358445Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:30.358476Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.367358Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:30.450158Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:30.486987Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:30.487035Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:30.500931Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:30.500978Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:30.522549Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:30.522579Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.528482Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:16:30.548748Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:30.570827Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:30.570851Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.584457Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:16:30.599474Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:30.612683Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:30.615228Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:30.649538Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:30.649568Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.651509Z  INFO local_candidate{attempt=33}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:16:30.670724Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:30.673035Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:30.673053Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.676021Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:30.682018Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:16:30.682356Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:30.687800Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:30.689688Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:30.692668Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:16:30.692685Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.693917Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:30.693934Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.705189Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:16:30.712696Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:30.722828Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:30.723324Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:30.723335Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.724752Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:30.742727Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:30.743887Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:30.743907Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.746574Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:30.764974Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:30.767659Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:30.767683Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.769901Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:30.776707Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:30.776735Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:30.776879Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:30.776896Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.787464Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:30.787698Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:30.788456Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:30.788487Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.791145Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:30.813580Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:30.813620Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:30.814042Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:30.814052Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.814402Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:30.814416Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.815314Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:30.816905Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:30.818932Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:30.820971Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:30.823191Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:30.823220Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.824786Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:30.825466Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:30.825481Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.825542Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:30.826931Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:30.827286Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:30.832383Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:30.832658Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:16:30.839784Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:30.861035Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:30.861057Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.874889Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:30.896838Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:30.927301Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:30.927400Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:30.967356Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:31.001292Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:31.001328Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:31.014109Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:16:31.045915Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:31.086716Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:31.086752Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:31.125567Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:31.145594Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:31.153012Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:31.155613Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:31.173079Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:31.173101Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:31.179075Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:31.179096Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:31.187461Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:31.203521Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:31.242652Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:31.242688Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:31.303071Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:31.322546Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:16:31.322570Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:31.333273Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:16:31.402507Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:31.485486Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:31.511517Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:31.511544Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:31.541425Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:31.546072Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:31.561610Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:31.585359Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:31.585386Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:31.595611Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:31.595631Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:31.615991Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:31.647668Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:31.922959Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:31.922996Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:31.951100Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:32.124175Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:32.194445Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:32.194476Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:32.241250Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:32.268243Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:32.287894Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:32.287922Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:32.298858Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:32.309550Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:32.352528Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:32.352553Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:32.425034Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:32.745906Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:32.871838Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:32.871872Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:32.916091Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:33.175843Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:33.178632Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:33.228747Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:33.228770Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:33.236847Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:33.236868Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:33.310139Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:33.332735Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:33.478835Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:16:33.533863Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:33.533890Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:33.557114Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:16:33.600871Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=30 success=true
2026-09-12T18:16:33.603812Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:16:33.609428Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:33.877808Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:33.907791Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:33.907820Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:33.916942Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:33.957981Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:33.992537Z  INFO local_candidate{attempt=34}: exchange table and repeat patch storage exchange_table_bytes=27948 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:16:34.008029Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=35 success=true
2026-09-12T18:16:34.010932Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:16:34.017049Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:34.032750Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:34.032774Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:34.074553Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:34.085757Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:34.085791Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:34.094314Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=8706 success=true
2026-09-12T18:16:34.160743Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:16:34.352052Z  INFO local_candidate{attempt=30}: exchange table and repeat patch storage exchange_table_bytes=27400 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:16:34.926515Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:34.950338Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:34.950361Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:34.980642Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:35.018290Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=27 success=true
2026-09-12T18:16:35.022367Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-12T18:16:35.030525Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=39 success=true
2026-09-12T18:16:35.031480Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:35.031590Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=38 success=true
2026-09-12T18:16:35.033911Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:16:35.034674Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:16:35.043114Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:35.044121Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:35.195877Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:35.215877Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:35.215928Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:35.235524Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:35.272830Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=25 success=true
2026-09-12T18:16:35.275989Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:16:35.281843Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:35.385726Z  INFO local_candidate{attempt=42}: exchange table and repeat patch storage exchange_table_bytes=27980 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:16:35.387458Z  INFO local_candidate{attempt=41}: exchange table and repeat patch storage exchange_table_bytes=28028 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:16:35.387649Z  INFO local_candidate{attempt=31}: exchange table and repeat patch storage exchange_table_bytes=27400 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:16:35.633110Z  INFO local_candidate{attempt=32}: exchange table and repeat patch storage exchange_table_bytes=27996 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:16:35.744183Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:35.764034Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:35.764075Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:35.775430Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:35.819020Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:35.820754Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:35.820777Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:35.823922Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:35.842841Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=66 success=true
2026-09-12T18:16:35.842879Z  INFO local_candidate{attempt=34}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=27948 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:16:35.842895Z  INFO local_candidate{attempt=34}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27948 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:36.144243Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:36.258729Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:16:36.258768Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.287102Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=67 success=true
2026-09-12T18:16:36.287144Z  INFO local_candidate{attempt=30}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10068 exchange_table_bytes=27400 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:16:36.287158Z  INFO local_candidate{attempt=30}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27400 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10068 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:36.360487Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=517 success=true
2026-09-12T18:16:36.362761Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:36.368583Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:36.370944Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:36.371130Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:36.371642Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:36.371659Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.372800Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:36.375654Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:36.377042Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:36.379045Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:36.379795Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:36.379809Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.379839Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:36.380804Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:36.380822Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.381921Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:36.382995Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:36.386898Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:36.399151Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:36.399635Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:16:36.400011Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:36.400025Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.400040Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:36.400461Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:36.400473Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.402157Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:36.403070Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:36.410757Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:36.421071Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:36.421826Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:36.421844Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.423770Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:36.432953Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:36.441111Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:36.443982Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:36.444953Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:36.452020Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:36.453771Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:36.453795Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.457223Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:36.457511Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:36.465765Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:36.515408Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:36.521364Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:36.521384Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.528139Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:36.552848Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:36.553680Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:36.553699Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.556360Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:36.573502Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:36.580710Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:36.580740Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.583432Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:36.583469Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:36.592462Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:16:36.597233Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:36.616011Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:36.616788Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:16:36.616802Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.618273Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:36.618921Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:16:36.618925Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:36.618941Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.620802Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:36.632687Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:36.633244Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:16:36.633254Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.634574Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:16:36.660387Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:36.662219Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:36.662235Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.664140Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:36.664424Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:36.665578Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:36.665597Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.668267Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:36.675161Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:36.683780Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:36.702314Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:36.735453Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:36.735499Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.775089Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:36.796261Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:36.796794Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:36.796804Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.798127Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:36.804167Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:36.809279Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:36.946588Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:36.951814Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:36.951837Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:36.957717Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:37.016623Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:37.016662Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:37.039834Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:37.042436Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:16:37.062240Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:37.062274Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:37.063759Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:37.063781Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.073769Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:16:37.093955Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:37.280405Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:37.299113Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:37.309081Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:37.309123Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.316266Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:37.316296Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.327330Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:37.357300Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:37.399095Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:37.400398Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:37.400422Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.401049Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:37.403765Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:37.419302Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:37.419332Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.434637Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:37.452490Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:37.465165Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:37.465227Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.473854Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:37.475252Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:37.475270Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.477768Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:37.491060Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:37.531513Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:37.533955Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:37.533984Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.537508Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:37.606930Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:37.625313Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:37.632611Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:37.632645Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.636913Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:37.639347Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:37.639370Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.645993Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:37.656728Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:37.656746Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.670513Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:37.670557Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:37.753466Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:37.784079Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:37.784104Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.827419Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:37.870647Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=586 success=true
2026-09-12T18:16:37.870678Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=323 success=true
2026-09-12T18:16:37.870687Z  INFO local_candidate{attempt=31}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10068 exchange_table_bytes=27400 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:16:37.870706Z  INFO local_candidate{attempt=32}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10008 exchange_table_bytes=27996 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:16:37.870716Z  INFO local_candidate{attempt=31}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27400 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10068 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:37.870723Z  INFO local_candidate{attempt=32}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27996 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10008 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:37.870739Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=264 success=true
2026-09-12T18:16:37.870746Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=98 success=true
2026-09-12T18:16:37.870765Z  INFO local_candidate{attempt=42}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=9948 exchange_table_bytes=27980 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:16:37.870783Z  INFO local_candidate{attempt=41}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10008 exchange_table_bytes=28028 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:16:37.870794Z  INFO local_candidate{attempt=42}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=27980 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9948 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:37.870808Z  INFO local_candidate{attempt=41}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28028 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10008 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:37.883342Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:37.884027Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:37.884043Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:37.885672Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:38.071235Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:38.101271Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:38.101311Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.151407Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:38.189166Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:38.210147Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:38.210173Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.219948Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:38.221890Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:38.272789Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:38.272830Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.347909Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:38.426115Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:38.482316Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=611 success=true
2026-09-12T18:16:38.482631Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=611 success=true
2026-09-12T18:16:38.486533Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=615 success=true
2026-09-12T18:16:38.487026Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:38.504033Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:38.507479Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=636 success=true
2026-09-12T18:16:38.510356Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:38.511245Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:38.511421Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:38.511438Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.512295Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:38.512311Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.513745Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:38.514788Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:38.515678Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:38.516860Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:16:38.516880Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=496 selected_horizon=496 endpoint_lower_bound=288 lower_bound_gap=208 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.519482Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=1431 row_words=13 horizon=496
2026-09-12T18:16:38.522456Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:38.523166Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:38.523181Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.525538Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:38.532563Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:38.533022Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:38.533031Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.534325Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:38.536925Z  INFO local_candidate{attempt=33}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:38.540531Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:38.541115Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:38.541129Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.542618Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:38.545493Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:38.549938Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:38.556356Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:38.556395Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:38.558120Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:38.558917Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:38.567240Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:38.567273Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:38.567555Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:38.567973Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:38.567982Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.569363Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:38.572784Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:38.596279Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:38.611878Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:38.615760Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:38.624604Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:38.653004Z  INFO local_candidate{attempt=33}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:38.653038Z  INFO local_candidate{attempt=33}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.659665Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:38.665138Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:38.665160Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.673712Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=25 success=true
2026-09-12T18:16:38.674427Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:38.677597Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:16:38.691309Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:16:38.692403Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:38.692959Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:38.692977Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.694570Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:38.713930Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:38.722518Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:38.722538Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.732496Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:38.733682Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:38.733702Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.734955Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:38.735721Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:38.748653Z  INFO local_candidate{attempt=33}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:38.773349Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=20294 success=true
2026-09-12T18:16:38.823809Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:38.878820Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:38.878857Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.925448Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:38.943312Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:38.965731Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:38.966610Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:38.966628Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:38.968586Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:38.977846Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:38.984985Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:39.022431Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:39.022469Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.056431Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:39.061937Z  INFO local_candidate{attempt=40}: exchange table and repeat patch storage exchange_table_bytes=28028 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:16:39.095259Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:39.095298Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.108412Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:39.128875Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:39.134043Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:39.142460Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:39.142490Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.168915Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:39.191957Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:39.205139Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:39.205166Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.207579Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:39.214745Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:39.219053Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:39.223327Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:39.223361Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:39.226317Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:39.226341Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.236848Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:39.236883Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.237257Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:39.238764Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:39.239711Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:39.239723Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.241471Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:39.247661Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:39.254021Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:39.254538Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:39.254548Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.254940Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:16:39.256223Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:39.261405Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:39.267320Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:39.268535Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:39.268549Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.271186Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:39.274427Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:39.274446Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.274881Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=14826 success=true
2026-09-12T18:16:39.279314Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:39.280744Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:39.280767Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.283580Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:39.287388Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:39.309497Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:39.313924Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:39.314860Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:39.314878Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.315497Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:39.315519Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.318222Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:39.323746Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:39.420101Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:39.420140Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:39.427504Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:16:39.473460Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:39.509757Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:39.510865Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:39.524379Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:39.524450Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.528476Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:39.528563Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.537888Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:39.543336Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:39.547112Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:39.547138Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.564398Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:39.571622Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:39.571641Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.581032Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:39.582274Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:39.582481Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:39.582496Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.585126Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:39.597410Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:39.646595Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:39.674388Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:39.674412Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.719405Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:39.739883Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:39.752018Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:39.752050Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.758056Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:39.830437Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:39.837449Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:39.851957Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:39.851979Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.862145Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:39.862175Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.867222Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:16:39.874918Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:39.882361Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:39.882378Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.888071Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:39.893026Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:39.903482Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:39.916438Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:39.918538Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:39.918553Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.921189Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:39.977825Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:39.977857Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:39.981446Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:40.002398Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:40.002433Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.017386Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:40.060817Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:40.065693Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:40.065715Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.067318Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:40.069592Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:40.069609Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.070957Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:16:40.072416Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:40.093659Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:40.148169Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:40.148735Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:16:40.149536Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:16:40.149549Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.152451Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:16:40.159819Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:40.209765Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:40.209814Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:40.222029Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:40.232190Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:40.235485Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:16:40.256424Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:40.256922Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:40.256932Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.257960Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:40.263268Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:40.275414Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:40.275915Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:40.275924Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.277565Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:40.358962Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:40.368119Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:40.368154Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:40.381290Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:40.381314Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.393164Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:16:40.413406Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:40.481351Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:40.507833Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:40.507866Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.523459Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:40.538705Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:40.538740Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:40.544979Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:40.546761Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:16:40.547698Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:40.548623Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:40.548643Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.552356Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:40.552373Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.554497Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:40.557237Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:40.565157Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:40.579642Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:40.580142Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:40.580159Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.580721Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:16:40.580735Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.583194Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:16:40.598971Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:40.599625Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:16:40.599635Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.601068Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:16:40.625622Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:40.633893Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:40.634967Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:40.636957Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:40.636984Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.641759Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:40.657736Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:40.658823Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:40.659442Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:40.659464Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.659827Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:16:40.659840Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.662313Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:16:40.667885Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:40.677679Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:40.678338Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:16:40.678348Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.679792Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:16:40.689368Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:40.712909Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:40.722585Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:40.732196Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:40.740959Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:40.740997Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.771076Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:40.866809Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:40.892249Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:40.892271Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:40.925876Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:40.973618Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:40.973659Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:41.063888Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:16:41.111389Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:41.112572Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:41.112589Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:41.114904Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:41.219673Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:41.237278Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:41.246909Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:41.246932Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:41.248833Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:41.248861Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:41.263012Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:41.289296Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:41.313041Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:41.313577Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:41.313588Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:41.314888Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:41.371908Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:41.377450Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:41.379855Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:41.379871Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:41.382546Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:41.398381Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:41.398403Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:41.431439Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:41.610728Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:16:41.643602Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:41.643626Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:41.681352Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:16:41.722217Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=781 success=true
2026-09-12T18:16:41.722259Z  INFO local_candidate{attempt=40}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10008 exchange_table_bytes=28028 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:16:41.722273Z  INFO local_candidate{attempt=40}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28028 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10008 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:16:41.763662Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:41.786554Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:41.786580Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:41.803489Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:41.833976Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:41.854618Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:41.855459Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:41.855482Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:41.858744Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:41.914743Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:41.917116Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:41.917133Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:41.919802Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:16:41.933131Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:41.966095Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:41.966124Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.000601Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:42.011383Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:42.012786Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:42.012804Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.029982Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:42.075657Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:42.127527Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:42.148215Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:42.148241Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.155991Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:42.156012Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.193928Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:42.195011Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:42.202938Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:42.202971Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.213553Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:42.216801Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:42.217303Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:42.217313Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.218643Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:42.226047Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:42.230978Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:42.232859Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:42.244196Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:42.314259Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:42.337106Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:42.337135Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.352583Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:42.400696Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:42.479421Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=757 success=true
2026-09-12T18:16:42.516873Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:42.516916Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.524332Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:42.562874Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:42.574967Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:42.574993Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.581160Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:42.608026Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:42.608048Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.612314Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:42.612337Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.636504Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:42.641848Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:42.674571Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:42.680363Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:42.682398Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:42.685577Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:42.704180Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:42.704772Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:42.704787Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.707238Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:42.722882Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:42.723456Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:42.723474Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.725030Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:42.733243Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:42.735364Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:42.737449Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:42.737471Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.751010Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:42.751974Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:42.751998Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.754122Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:42.754762Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:42.754777Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.754934Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:42.756990Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:42.772632Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:42.773166Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:42.773179Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.774599Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:42.782552Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:42.803933Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:42.804881Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:42.804899Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:42.807959Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:42.822522Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:16:42.987753Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:43.031572Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:43.031622Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.068660Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:43.091105Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5680 paired_horizon=11275 use_paired=false
2026-09-12T18:16:43.153277Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:43.153313Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5680 selected_horizon=5680 endpoint_lower_bound=4656 lower_bound_gap=1024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:43.180520Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=344 horizon=5680
2026-09-12T18:16:43.194749Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:43.203771Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:43.217381Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:43.217794Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:43.217802Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.219278Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:43.229446Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:43.229798Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:43.229806Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.230732Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:43.235868Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:43.238817Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:43.240447Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:43.241679Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:43.242259Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:43.248709Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:43.248732Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:43.252441Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:43.252468Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.252558Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:43.261961Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=452 row_words=53 horizon=8353
2026-09-12T18:16:43.263352Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:43.290029Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:43.291166Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:43.291180Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.293070Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:43.300576Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:43.321567Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:43.328663Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:43.328686Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.336439Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:43.350909Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:43.351338Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:43.351348Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.352483Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:43.379168Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:43.379922Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:43.379935Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.380113Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:43.380143Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.381670Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:43.454016Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:43.477620Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:43.480177Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:43.480220Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.510024Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:43.514989Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:43.521297Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:43.522758Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:43.522782Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.530334Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:43.540290Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:43.549800Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:43.550186Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:43.550195Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.551691Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:43.558380Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:43.561416Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:43.561784Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:43.561792Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.562859Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:43.567721Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:43.571877Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:43.573013Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:43.573565Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:43.581792Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:43.581811Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.597929Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:43.609871Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:43.631402Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:43.631868Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:43.631876Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.633148Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:43.641173Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:43.663256Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:43.667538Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:43.667558Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.674505Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:43.679270Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:43.687046Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:43.687465Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:43.687476Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.688524Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:43.714484Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:43.715288Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:43.715301Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.717022Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:43.726036Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:43.726059Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.888188Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:43.937829Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:43.938841Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:43.938856Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:43.941275Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1452 row_words=15 horizon=3578
2026-09-12T18:16:44.086148Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:44.092260Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:16:44.100059Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:44.100082Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.106873Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:44.126511Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:44.127101Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:44.127110Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.129007Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:44.140052Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:44.140504Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:44.140514Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.141585Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:44.146829Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:44.148164Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:44.148186Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:44.151172Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:44.161258Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:44.161655Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:44.161661Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.162906Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:44.173810Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:16:44.198256Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:44.208191Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:44.251027Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:44.251094Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.285835Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:44.359075Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:44.394602Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:44.394627Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.396768Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:44.409593Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:44.409616Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.411229Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:44.415977Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:44.435273Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:44.435849Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:44.435859Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.437866Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:44.438483Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:44.446405Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:44.446422Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.448423Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:44.448828Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:44.448836Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.449874Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:44.454675Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:44.458836Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:44.472354Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:44.472379Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:44.479316Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:44.480251Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:44.489024Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:16:44.497607Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:44.497636Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.503008Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:44.514264Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:44.515094Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:44.515114Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.549349Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:44.575231Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:44.584474Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:44.585881Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:16:44.585895Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.588806Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:16:44.596080Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:44.604694Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:44.610446Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:44.610462Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.617762Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:44.627498Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:44.632310Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:44.634130Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:44.640981Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:44.650942Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:44.660617Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:44.660643Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.661239Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:44.666904Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:44.666922Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.673952Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:44.683625Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:44.688455Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:44.690296Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:44.782830Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:44.808350Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:44.808387Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:44.813333Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:44.821641Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:44.833404Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:44.833427Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.844418Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:44.847143Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:16:44.849379Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:44.849401Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.870477Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:44.871408Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:44.871423Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.873790Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:16:44.892572Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:44.894703Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:44.894718Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.897137Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:44.950278Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:44.994680Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:44.995510Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-12T18:16:44.995524Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:44.997828Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:45.047184Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:45.047241Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:45.068871Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:16:45.073218Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:45.092394Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:45.160669Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:45.160704Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.208564Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:45.214001Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:45.214035Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:45.217422Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:45.217450Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:45.220786Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:16:45.273022Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:45.334998Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:45.337313Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:45.337344Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.342701Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:45.346836Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:45.347866Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:45.357178Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:45.367101Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:45.367121Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.372105Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:45.372588Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:45.372601Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.374798Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:45.380978Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:45.386075Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:45.386501Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:45.386512Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.387895Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:45.391713Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:45.393906Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:45.399236Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:45.400629Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:45.401198Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:45.413072Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:45.428510Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:45.430775Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:45.430793Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.433652Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:45.434572Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:45.434598Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.444885Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:45.473342Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:45.473368Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.474394Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:45.478256Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:45.483382Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:45.483399Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.492033Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:45.505607Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:45.505816Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:45.506309Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:45.506320Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.507609Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:45.509843Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:45.537535Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:45.537572Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.539763Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:45.540268Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:45.540276Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.541517Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:45.545076Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:45.545922Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:45.545942Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.547481Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:45.576403Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:45.593922Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:45.596155Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:45.596172Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.598669Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:45.612673Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:45.636593Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:45.636617Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.661238Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:45.686632Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:45.686668Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:45.729668Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:45.761521Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:45.762093Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:45.762107Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.763296Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:45.769004Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:45.782915Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:45.783511Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:45.783523Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.785660Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:45.811220Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:45.816426Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:45.816448Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:45.822483Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:16:45.954073Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:45.967974Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:45.988556Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:45.988579Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.001526Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:46.018816Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:46.018845Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.064053Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:46.087448Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:46.087476Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.115172Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:16:46.116140Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:46.251431Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:46.284785Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:46.284810Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.323699Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:46.332909Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:46.349413Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:46.349449Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.353697Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:46.353730Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:46.361363Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:46.392578Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:46.393703Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:46.393723Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.397175Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:46.417403Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:46.418150Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:46.418178Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.420095Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:46.428245Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:46.433287Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:46.444503Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:16:46.454921Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:46.468588Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:46.469011Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:46.469019Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.470741Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:46.487474Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:46.530383Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:46.530408Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.552973Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:46.563476Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:46.617272Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:46.617304Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.654228Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:46.654272Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:46.664836Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:46.681173Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:46.686015Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:46.689717Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:46.702315Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:46.702766Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:46.702775Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.704866Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:46.715409Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:46.715832Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:46.715841Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.716952Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:46.722597Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:46.727535Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:46.728849Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:46.729452Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:46.746056Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:46.764883Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:46.764924Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:46.778741Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:16:46.799273Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:46.826445Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:46.826472Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.848278Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:46.852885Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:46.852906Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.857112Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:46.861776Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:46.879467Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:46.879911Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:46.879921Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.881184Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:46.909916Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:46.910739Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:46.910753Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:46.912597Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:47.119006Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:47.119047Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:47.157682Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:16:47.227586Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:47.303837Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:16:47.309518Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:16:47.309545Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:47.317666Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:16:47.341444Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:47.341482Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.358806Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:47.358837Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:47.378179Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:16:47.414639Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:47.441328Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:47.483481Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:47.493066Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:47.493096Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.493645Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:47.514743Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:47.514771Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.533582Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:47.533608Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.565743Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:47.570999Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:47.585972Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:47.589640Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:47.590126Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:47.590133Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.591471Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:47.640892Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:47.643094Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:47.643110Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.645561Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:16:47.692733Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:47.705707Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:47.720170Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:47.720199Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.727909Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:47.743710Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:47.751831Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:47.752793Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:47.752816Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.756017Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:47.756045Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.756811Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:47.757039Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:47.766673Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:47.766715Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.775682Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:47.776404Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:47.776423Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.778226Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:47.778625Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:47.781303Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:47.784144Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:47.788948Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:47.789100Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:47.794298Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:47.796275Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:47.811511Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:47.812412Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:47.812424Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.815185Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:16:47.829195Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:47.829243Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:47.836517Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:47.837315Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:47.837327Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.839541Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:47.879632Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:47.897702Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:47.898447Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:47.898759Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:47.898772Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.899510Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:47.903957Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:47.908519Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:47.908550Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:47.915625Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:47.916064Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:47.916072Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.917567Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:47.926376Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:47.929767Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:47.939928Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:47.940399Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:47.940410Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.942054Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:47.942656Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:47.946619Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:47.946638Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.963942Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:47.963970Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.989010Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:47.990660Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:47.990683Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:47.993190Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:48.003709Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:48.005849Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:48.011283Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:48.011481Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:48.021432Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:48.029371Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:48.040608Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:48.045777Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:48.045796Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.052279Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:48.053311Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:16:48.053331Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.066764Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:16:48.360150Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:48.360191Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:48.441128Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:16:48.547429Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:48.550104Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:48.550124Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.552165Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=14457 success=true
2026-09-12T18:16:48.553043Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:48.584457Z  INFO local_candidate{attempt=39}: costed final placed program final_cycles=11828137 final_exchange=4928725
2026-09-12T18:16:48.614059Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:48.635860Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:48.655912Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:48.655939Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.663168Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:48.663190Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.682827Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:48.692434Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:48.696299Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:48.704992Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:48.717319Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:48.717352Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.731604Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:48.732565Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:48.745911Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:48.750860Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:48.750885Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.754325Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:48.770966Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:48.788769Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:48.788795Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.798815Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:48.804857Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:48.804878Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12868 selected_horizon=12868 endpoint_lower_bound=11940 lower_bound_gap=928 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.809414Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:48.824936Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:48.826786Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:48.826834Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:48.829304Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:48.829347Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.832298Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:48.857192Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:16:48.859950Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:48.859986Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:48.865949Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-12T18:16:48.881660Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:48.881687Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.895119Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:48.895158Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.897535Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:48.902675Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:48.903495Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:48.904132Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:48.904142Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.905553Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:48.907903Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:48.907926Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.913692Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:48.916440Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:48.926957Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:48.927869Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:48.927886Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:48.930250Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:48.936272Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:48.986648Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=12699 success=true
2026-09-12T18:16:48.991417Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:16:48.993468Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:16:48.996594Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:49.002442Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:16:49.002461Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.014221Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:16:49.035362Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:49.035394Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:49.036808Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:16:49.041621Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:16:49.042012Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:49.042019Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.043091Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:16:49.044893Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:16:49.046969Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:49.057362Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:16:49.057721Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:49.057728Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.059181Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:16:49.068261Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:16:49.068588Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:49.068594Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.069419Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:16:49.073384Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:16:49.073415Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.074133Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:16:49.078437Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:16:49.079599Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:16:49.080123Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:16:49.083619Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:16:49.085507Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:16:49.086407Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:49.089501Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:16:49.093048Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:49.107586Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:49.107607Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.132728Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:49.140161Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:49.144884Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:49.144918Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.159415Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:16:49.164140Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:16:49.164755Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:16:49.164774Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.166043Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:16:49.166069Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.166264Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:16:49.168607Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:49.175019Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:16:49.186887Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:49.186916Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:49.187319Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:16:49.187727Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:49.187736Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.188750Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:16:49.193461Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:16:49.197536Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:16:49.200196Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:16:49.201728Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:16:49.202438Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:16:49.202450Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.203954Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:16:49.226140Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:16:49.227250Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:16:49.227274Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.229861Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:16:49.232188Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:49.246262Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:16:49.246959Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:16:49.246968Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.248687Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:16:49.256862Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:49.256881Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.256931Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:49.285483Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:49.294264Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:16:49.304673Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:16:49.361362Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:49.361399Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.423479Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:49.447075Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:49.447097Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.475387Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:49.521183Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:49.707908Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:49.707954Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:49.746021Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:49.784538Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:49.785719Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:49.785735Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.788186Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:49.806172Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:16:49.829095Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:16:49.829127Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.853440Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:16:49.872411Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:16:49.889439Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:16:49.889464Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.894261Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:16:49.901485Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:16:49.908361Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:16:49.908380Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.915696Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:16:49.936647Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:16:49.937944Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:16:49.937959Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.938491Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:16:49.939215Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:16:49.939228Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:49.940241Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:16:49.941341Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:16:49.962782Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:16:49.962832Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:49.989157Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:49.996062Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:16:49.998843Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:16:50.003263Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:16:50.003282Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.007973Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:16:50.026559Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:50.054703Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:50.054747Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.061191Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:50.061230Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.085540Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:50.115552Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:16:50.115966Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:50.115993Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:50.125806Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:16:50.125826Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.136787Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:16:50.157106Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:50.174562Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:50.174877Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:16:50.175826Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:16:50.175844Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.178467Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:16:50.203371Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:16:50.212110Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:16:50.212136Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.225807Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:16:50.260296Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:16:50.262843Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:16:50.265808Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:16:50.265823Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.268501Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:16:50.280780Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:16:50.280811Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:50.287122Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:16:50.287147Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.300657Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:16:50.306636Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:16:50.361890Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:16:50.363856Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:16:50.363872Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.366172Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:16:50.406361Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:16:50.432495Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:50.432521Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.459617Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:50.477738Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:16:50.501845Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:16:50.502351Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:16:50.502361Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.504173Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:16:50.527635Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:16:50.533108Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:50.533141Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.538054Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:16:50.538076Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.555360Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:16:50.582910Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:50.582973Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:50.582998Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:50.611495Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:16:50.611977Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:16:50.611987Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.613060Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:16:50.618357Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:16:50.633337Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:16:50.634263Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:16:50.634285Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.637249Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:16:50.672870Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:16:50.734764Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:16:50.755482Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:16:50.755518Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.765758Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:16:50.896594Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:50.923299Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:50.923328Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:50.952254Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:50.995710Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:16:51.016565Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:16:51.016598Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.054283Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:16:51.136570Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:16:51.142568Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:16:51.142593Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.150046Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:16:51.160227Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:16:51.165361Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:16:51.167294Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:16:51.209248Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:16:51.211199Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:16:51.211358Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.215698Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:16:51.226612Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:16:51.235371Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:16:51.235844Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:16:51.235855Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.237416Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:16:51.273323Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:16:51.304287Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:16:51.304311Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.323114Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:51.341054Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:16:51.396632Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:51.400759Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:51.400790Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.438386Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:51.438416Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.462577Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:51.471902Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:51.495838Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:51.524960Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:51.525006Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.575134Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:51.614488Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:51.676607Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:16:51.676641Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.686756Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:16:51.704995Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:16:51.705019Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.733182Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:16:51.842598Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:16:51.890343Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:51.926296Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:51.926326Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:51.971694Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:16:52.285948Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:16:52.294910Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:52.321772Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:16:52.321800Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:52.363404Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:16:52.389154Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:16:52.389179Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:52.407674Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:16:52.472279Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:52.472318Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:52.498076Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:16:52.529090Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:16:52.564558Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:16:52.564609Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:52.597531Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:16:52.897347Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:16:52.908280Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:52.925260Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:52.925296Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:52.940478Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:16:52.940499Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:53.012870Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:16:53.013823Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:16:53.018692Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:16:53.027711Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:53.027740Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:53.073031Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:53.074501Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:16:53.074522Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:53.094315Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:16:53.100409Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:16:53.160845Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:16:53.160890Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:53.174624Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:16:53.191799Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:16:53.191834Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:53.198726Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=3388 success=true
2026-09-12T18:16:53.208682Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:16:53.266075Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=67 success=true
2026-09-12T18:16:53.318692Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:16:53.353783Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:16:53.381381Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:16:53.381403Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:53.406634Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:16:53.428176Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:16:53.486945Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:16:53.486976Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:53.510552Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:16:53.530162Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:16:53.530216Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:53.610888Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:16:53.714742Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:16:53.726298Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=412 success=true
2026-09-12T18:16:53.766128Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:16:53.766154Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:53.847002Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:16:54.077076Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=15303 success=true
2026-09-12T18:16:54.105681Z  INFO local_candidate{attempt=37}: costed final placed program final_cycles=11828137 final_exchange=4928725
2026-09-12T18:16:55.317333Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=74 success=true
2026-09-12T18:16:55.410578Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=93 success=true
2026-09-12T18:16:55.661615Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=16386 success=true
2026-09-12T18:16:55.693116Z  INFO local_candidate{attempt=38}: costed final placed program final_cycles=11828137 final_exchange=4928725
2026-09-12T18:16:55.877217Z  INFO local_candidate{attempt=37}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=418 success=true
2026-09-12T18:16:56.526477Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:16:56.626664Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:16:56.626693Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:16:56.675247Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:16:56.690920Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=7704 success=true
2026-09-12T18:16:56.921756Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=88 success=true
2026-09-12T18:16:57.015183Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=93 success=true
2026-09-12T18:16:57.466562Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=403 success=true
2026-09-12T18:16:58.081250Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:16:58.119637Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:16:58.119671Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:58.151060Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:16:59.073856Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:16:59.116875Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:16:59.116903Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:16:59.150643Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:17:00.161165Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:17:00.190092Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:17:00.190120Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:00.221874Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:17:00.237285Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=30447 success=true
2026-09-12T18:17:01.657130Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:01.696176Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:01.696214Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:01.747380Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:01.762237Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=23254 success=true
2026-09-12T18:17:01.789817Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=27 success=true
2026-09-12T18:17:01.793038Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:17:01.793750Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=31 success=true
2026-09-12T18:17:01.796948Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:17:01.798868Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:17:01.802946Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:17:01.803555Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=40 success=true
2026-09-12T18:17:01.808004Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-12T18:17:01.816279Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:17:01.954174Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:17:01.954225Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:01.965753Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:17:02.173492Z  INFO local_candidate{attempt=35}: exchange table and repeat patch storage exchange_table_bytes=27948 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:17:02.187275Z  INFO local_candidate{attempt=33}: exchange table and repeat patch storage exchange_table_bytes=27948 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:17:02.189011Z  INFO local_candidate{attempt=36}: exchange table and repeat patch storage exchange_table_bytes=27948 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:17:04.192739Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=171 success=true
2026-09-12T18:17:04.192780Z  INFO local_candidate{attempt=36}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=27948 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:17:04.192794Z  INFO local_candidate{attempt=36}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27948 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:17:04.192793Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=170 success=true
2026-09-12T18:17:04.192822Z  INFO local_candidate{attempt=35}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=27948 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:17:04.192838Z  INFO local_candidate{attempt=35}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27948 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:17:04.192918Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=174 success=true
2026-09-12T18:17:04.192948Z  INFO local_candidate{attempt=33}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=27948 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:17:04.192963Z  INFO local_candidate{attempt=33}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27948 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:17:04.261678Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:17:04.336275Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:17:04.336313Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.397243Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:17:04.419966Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=25937 success=true
2026-09-12T18:17:04.420008Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=25933 success=true
2026-09-12T18:17:04.736032Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=543 success=true
2026-09-12T18:17:04.738166Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:04.746793Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=553 success=true
2026-09-12T18:17:04.747330Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=554 success=true
2026-09-12T18:17:04.747715Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:04.751411Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:04.752052Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:04.752062Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.753167Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:04.753736Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:04.756049Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:04.756807Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:04.756821Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.758812Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:04.759476Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:04.760796Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:04.761118Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:04.761184Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:04.761193Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.761425Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:04.762497Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:04.762497Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:04.762533Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.762690Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:04.765813Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:04.769000Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:04.771859Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:04.772216Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:04.772225Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.773170Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:04.774419Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:04.775070Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:17:04.777113Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:17:04.777135Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.777901Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:04.782162Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:17:04.782317Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:04.783504Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:04.784057Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:04.793373Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:04.793719Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:04.793726Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.794850Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:04.798217Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:04.799032Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:04.799048Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.802144Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:04.805098Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:04.808047Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:04.808060Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.810259Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:17:04.811563Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:17:04.811577Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.813316Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:04.814276Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:17:04.816484Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:04.818711Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:04.818742Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.822152Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:04.823921Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:04.824298Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:04.824307Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.825119Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:04.826234Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:04.835030Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:04.838404Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:04.846664Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:04.847323Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:04.847341Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.848565Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:04.849042Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:04.849608Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:04.849633Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.853173Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:04.861469Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:04.869963Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:04.870551Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:04.870573Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.872294Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:04.877926Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:04.882702Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:04.883934Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:04.884531Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:04.894558Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:04.901443Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:04.909129Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:04.909150Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.911588Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:04.918563Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:04.930063Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:04.956406Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:04.960110Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:04.960125Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.963493Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:17:04.964871Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:17:04.964890Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.966691Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:04.968394Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:04.978746Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:04.979108Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:04.979116Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:04.980215Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:05.003964Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:17:05.005764Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:17:05.005783Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.006602Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:05.007216Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:05.007226Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.008732Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:05.010122Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:17:05.028702Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:05.037552Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:17:05.038827Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:17:05.038850Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.041503Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:17:05.044951Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:05.044972Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.061401Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:05.126339Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:05.143122Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:05.384133Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:05.398646Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:05.423523Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:05.423554Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.429055Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:05.429083Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.429430Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:05.452354Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:05.454558Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:05.455580Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:05.455599Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.491407Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:05.512354Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:05.514621Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:05.515128Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:05.515138Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.516452Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:05.522354Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:05.523704Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:05.523721Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.526996Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:05.529219Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:05.541384Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:05.541928Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:05.541937Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.543894Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:05.550393Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:05.564513Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:05.564551Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.567362Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:05.579862Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:05.586879Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:05.586917Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.598079Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:05.600810Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:17:05.600839Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:05.604558Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:17:05.610223Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:05.610239Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.615819Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:17:05.616551Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:05.617593Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:05.617606Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.619558Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:05.624693Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:17:05.625343Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:05.626399Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:05.626411Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.628343Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:05.630298Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:05.630319Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.636687Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:17:05.637955Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:17:05.806705Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:17:05.806741Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:05.815418Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:17:05.837421Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:05.850472Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:05.850495Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.853569Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:05.857348Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:05.858854Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:05.861953Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:05.861970Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.867226Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:05.867241Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.873139Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:05.879046Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:05.879151Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:05.879691Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:05.879703Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.882089Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:05.893505Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:05.893920Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:05.893928Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:05.895039Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:05.900476Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:05.907596Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:06.020244Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:17:06.040074Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:06.040099Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.053743Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:17:06.105852Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:06.108978Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:06.109008Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.113322Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:06.137266Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:17:06.137307Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:06.158241Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:17:06.166143Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:06.202131Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:06.202173Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.212244Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:17:06.246415Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:06.246472Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.257722Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:06.293363Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:17:06.313505Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:17:06.318803Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:17:06.319334Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:06.319346Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.320780Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:17:06.321519Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:17:06.321549Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:06.327895Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:17:06.333469Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:17:06.335922Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:17:06.335937Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.338132Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:06.338150Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.338859Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:17:06.361449Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:17:06.666289Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:17:06.676514Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:17:06.676544Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.696837Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:17:06.786172Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:17:06.802385Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:17:06.802424Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:06.804581Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:06.810821Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:17:06.810852Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.818299Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:17:06.827599Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:17:06.834335Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:17:06.835446Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:06.835479Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.856921Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:17:06.856960Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.858089Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:06.877703Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:06.893616Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:06.893658Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.900032Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:17:06.915887Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:06.929706Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:06.948910Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:17:06.950777Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:17:06.950800Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.953533Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:06.953567Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.955008Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:17:06.966126Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10275 success=true
2026-09-12T18:17:06.974379Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:06.975047Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:06.975062Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:06.976922Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:06.995127Z  INFO local_candidate{attempt=30}: costed final placed program final_cycles=12064355 final_exchange=4941445
2026-09-12T18:17:07.005243Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:07.036890Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:17:07.039518Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:17:07.039537Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.042663Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:17:07.043064Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:07.044188Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:17:07.045291Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:17:07.045306Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.047972Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:17:07.049315Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:17:07.049341Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:07.062460Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:17:07.064414Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:17:07.065115Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:17:07.065124Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.066645Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:17:07.112399Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:07.122870Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:07.137400Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:07.137894Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:07.137904Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.139000Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:07.146715Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:07.167489Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:07.168067Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:07.168079Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.169857Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:07.277007Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:07.306371Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:07.306415Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.342284Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:07.429296Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:17:07.444420Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:17:07.444445Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.459467Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:17:07.541437Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:17:07.545660Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:17:07.567793Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:17:07.567817Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.583329Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:17:07.605143Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:07.605785Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:07.605799Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.607833Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:07.615405Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:07.620953Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:07.620975Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.631235Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:07.638431Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:07.655620Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:07.656288Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:07.656325Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.658735Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:07.667547Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:07.670148Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:07.670557Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:07.670570Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.671599Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:07.676655Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:07.681294Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:07.682536Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:07.683113Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:07.727916Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:07.768837Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:07.769460Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:07.769473Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.770694Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:07.771408Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:07.776554Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:07.778114Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:07.778136Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.781192Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:07.788285Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:07.790774Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:07.791138Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:07.791146Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.792272Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:07.814418Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:07.815541Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:07.815569Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.818973Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:07.823047Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:07.824434Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:07.824457Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.827112Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:07.843323Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:07.843909Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:07.843930Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.845610Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:07.853935Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:07.875471Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:07.876227Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:07.876244Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.879286Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:07.896003Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:07.968288Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:07.968325Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:07.977951Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:17:08.021147Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:08.021185Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.026527Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:08.034981Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:08.035007Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.045094Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:08.047477Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:08.058351Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:08.061192Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:17:08.065612Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:08.070131Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:08.094879Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:17:08.096261Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:08.096277Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.098871Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:17:08.263071Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:17:08.283487Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:08.283512Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.297472Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:17:08.322842Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:17:08.343367Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:08.345929Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:08.345961Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.351257Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:08.371116Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:17:08.402374Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:17:08.402412Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.449855Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:17:08.449886Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.473330Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:08.486543Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:08.486568Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.493954Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:08.498009Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:17:08.518378Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:17:08.597130Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:17:08.653140Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:17:08.653175Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.697188Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:17:08.744460Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:08.766528Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:08.766551Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.770216Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:08.791423Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:08.817256Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:17:08.817296Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:08.818336Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:08.818388Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.860898Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:17:08.888264Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:08.890998Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:08.922642Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:08.922671Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.933643Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:17:08.938475Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:08.938497Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:08.943234Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:17:08.964966Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:09.051656Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:17:09.051708Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:09.063384Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:17:09.065187Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:09.088187Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:09.088241Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:09.117142Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:09.430667Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:17:09.430718Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:09.516744Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:17:09.520619Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:17:09.600409Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:17:09.600457Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:09.616692Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:17:09.632960Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:17:09.633435Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:09.670470Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:17:09.671645Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:17:09.671660Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:09.673454Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:09.673474Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:09.674293Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=1379 success=true
2026-09-12T18:17:09.674360Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:17:09.681735Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:17:09.681765Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:09.710553Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:17:09.719031Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:09.750658Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=76 success=true
2026-09-12T18:17:09.887140Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:09.893438Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:09.893462Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:09.900865Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:09.910843Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:09.915885Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:09.917797Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:10.038053Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:17:10.038093Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:10.052088Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:17:10.243170Z  INFO local_candidate{attempt=30}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=437 success=true
2026-09-12T18:17:10.265064Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:17:10.275348Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:17:10.275379Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:10.293085Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:17:10.682705Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:17:10.682746Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:10.714451Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:17:10.718476Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:17:10.801674Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:17:10.803986Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:17:10.804007Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:10.806986Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:17:10.813495Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:17:10.813525Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:10.888474Z  INFO local_candidate{attempt=30}: retained faster incumbent candidate_cycles=12064355 cycles=11833505
2026-09-12T18:17:10.920193Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:17:10.935305Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:17:10.939165Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:17:10.968752Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:10.979557Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:17:10.979590Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:10.980307Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:17:10.980330Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:10.986224Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:17:11.008360Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:17:11.018003Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:11.018026Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.024447Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:17:11.025796Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:17:11.043603Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:11.050737Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:11.050764Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.062156Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:11.062760Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:11.062780Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.064908Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:11.080751Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:17:11.080775Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.082752Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:17:11.083301Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:11.083314Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.085099Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:17:11.096855Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:17:11.103916Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:11.146195Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:17:11.147755Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:17:11.147774Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.150253Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:11.209879Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:17:11.210476Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:17:11.210510Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:11.233722Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:17:11.233748Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.250753Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:17:11.252381Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:17:11.302351Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:17:11.332401Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:17:11.351385Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:11.351431Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.372787Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:17:11.374229Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:17:11.374248Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.377233Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:11.405590Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:17:11.407679Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:17:11.407706Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.412837Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:17:11.473413Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:11.609780Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:17:11.686862Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:17:11.686888Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.704066Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:17:11.704104Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:11.724780Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:17:11.759224Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:17:11.845951Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:11.884299Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:11.884342Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:11.931763Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:12.009448Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:17:12.050775Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:17:12.050819Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:12.083188Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:17:12.094757Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:17:12.106997Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:17:12.107021Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:12.138749Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:17:12.158299Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11920 success=true
2026-09-12T18:17:12.184992Z  INFO local_candidate{attempt=29}: costed final placed program final_cycles=12064355 final_exchange=4941445
2026-09-12T18:17:12.387550Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:17:12.433708Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:17:12.433743Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:12.467026Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:17:12.474688Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:17:12.533949Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:17:12.533974Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:12.639345Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:17:12.710279Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:17:12.710316Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:12.745617Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:17:12.907814Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:17:12.969573Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:17:12.969597Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:13.066581Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:17:13.133512Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:17:13.177613Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:17:13.177638Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:13.211780Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:17:13.399956Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:17:13.482637Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:17:13.497953Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=139 success=true
2026-09-12T18:17:13.512048Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:17:13.512090Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:13.544614Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:17:13.544655Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:13.573062Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:17:13.579879Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=81 success=true
2026-09-12T18:17:13.672642Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:17:13.700224Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:17:13.768994Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:17:13.769032Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:13.776792Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:13.776818Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:13.844409Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:17:13.864681Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:14.019535Z  INFO local_candidate{attempt=29}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=389 success=true
2026-09-12T18:17:14.249326Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:17:14.401468Z  INFO local_candidate{attempt=29}: retained faster incumbent candidate_cycles=12064355 cycles=11833505
2026-09-12T18:17:14.407248Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:14.407275Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:14.461473Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:17:14.557507Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=12795 success=true
2026-09-12T18:17:14.594031Z  INFO local_candidate{attempt=31}: costed final placed program final_cycles=12064355 final_exchange=4941445
2026-09-12T18:17:14.870698Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:17:14.973624Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:17:14.973660Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:14.996675Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:14.996697Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:15.023483Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:17:15.055782Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:17:15.055975Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:17:15.095118Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:17:15.095150Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:15.149566Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:17:15.171692Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=10424 success=true
2026-09-12T18:17:15.791944Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=99 success=true
2026-09-12T18:17:15.849892Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:17:15.895407Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=103 success=true
2026-09-12T18:17:15.895440Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:17:15.895463Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:15.925140Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:17:15.937712Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=37455 success=true
2026-09-12T18:17:15.938332Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=33458 success=true
2026-09-12T18:17:15.938786Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=39578 success=true
2026-09-12T18:17:16.028101Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:17:16.155794Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:16.155826Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:16.212520Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:17:16.385377Z  INFO local_candidate{attempt=31}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=417 success=true
2026-09-12T18:17:16.394668Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11974 success=true
2026-09-12T18:17:16.416096Z  INFO local_candidate{attempt=32}: costed final placed program final_cycles=11838448 final_exchange=4931673
2026-09-12T18:17:16.501255Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:16.537350Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:16.537381Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:16.565028Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:16.576372Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=11829 success=true
2026-09-12T18:17:16.604969Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:16.653923Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:16.653995Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:16.681643Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:16.699144Z  INFO local_candidate{attempt=31}: retained faster incumbent candidate_cycles=12064355 cycles=11833505
2026-09-12T18:17:16.702083Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:16.702110Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:16.703516Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:16.712000Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:16.736853Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:16.737956Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:16.737969Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:16.739975Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:16.742582Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=12006 success=true
2026-09-12T18:17:17.642054Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=110 success=true
2026-09-12T18:17:17.728301Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=86 success=true
2026-09-12T18:17:17.926085Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=13506 success=true
2026-09-12T18:17:17.949670Z  INFO local_candidate{attempt=41}: costed final placed program final_cycles=11830166 final_exchange=4922671
2026-09-12T18:17:18.170775Z  INFO local_candidate{attempt=32}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=380 success=true
2026-09-12T18:17:18.428765Z  INFO local_candidate{attempt=32}: retained faster incumbent candidate_cycles=11838448 cycles=11833505
2026-09-12T18:17:19.196869Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=94 success=true
2026-09-12T18:17:19.302683Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=105 success=true
2026-09-12T18:17:19.855996Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=467 success=true
2026-09-12T18:17:25.717130Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10545 success=true
2026-09-12T18:17:25.746974Z  INFO local_candidate{attempt=33}: costed final placed program final_cycles=11833505 final_exchange=4926649
2026-09-12T18:17:26.147171Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10208 success=true
2026-09-12T18:17:26.182899Z  INFO local_candidate{attempt=40}: costed final placed program final_cycles=11830177 final_exchange=4922671
2026-09-12T18:17:26.227557Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10288 success=true
2026-09-12T18:17:26.258300Z  INFO local_candidate{attempt=34}: costed final placed program final_cycles=11833505 final_exchange=4926649
2026-09-12T18:17:26.260970Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10323 success=true
2026-09-12T18:17:26.284968Z  INFO local_candidate{attempt=42}: costed final placed program final_cycles=11831924 final_exchange=4926526
2026-09-12T18:17:26.744455Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10168 success=true
2026-09-12T18:17:26.777937Z  INFO local_candidate{attempt=35}: costed final placed program final_cycles=11833505 final_exchange=4926649
2026-09-12T18:17:26.988774Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=114 success=true
2026-09-12T18:17:27.030639Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10288 success=true
2026-09-12T18:17:27.065745Z  INFO local_candidate{attempt=36}: costed final placed program final_cycles=11833505 final_exchange=4926649
2026-09-12T18:17:27.106745Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=117 success=true
2026-09-12T18:17:27.522066Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=89 success=true
2026-09-12T18:17:27.522165Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=203 success=true
2026-09-12T18:17:27.606378Z  INFO local_candidate{attempt=33}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=446 success=true
2026-09-12T18:17:27.611477Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=89 success=true
2026-09-12T18:17:27.625802Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=103 success=true
2026-09-12T18:17:27.633300Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=99 success=true
2026-09-12T18:17:27.716507Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=83 success=true
2026-09-12T18:17:27.931894Z  INFO local_candidate{attempt=33}: retained faster incumbent candidate_cycles=11833505 cycles=11833505
2026-09-12T18:17:28.049621Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=112 success=true
2026-09-12T18:17:28.088702Z  INFO local_candidate{attempt=34}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=402 success=true
2026-09-12T18:17:28.149961Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=100 success=true
2026-09-12T18:17:28.150134Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=459 success=true
2026-09-12T18:17:28.203852Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=422 success=true
2026-09-12T18:17:28.350681Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=116 success=true
2026-09-12T18:17:28.431235Z  INFO local_candidate{attempt=34}: retained faster incumbent candidate_cycles=11833505 cycles=11833505
2026-09-12T18:17:28.464635Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=113 success=true
2026-09-12T18:17:28.625576Z  INFO local_candidate{attempt=35}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=421 success=true
2026-09-12T18:17:28.920059Z  INFO local_candidate{attempt=35}: retained faster incumbent candidate_cycles=11833505 cycles=11833505
2026-09-12T18:17:29.010182Z  INFO local_candidate{attempt=36}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=447 success=true
2026-09-12T18:17:29.490141Z  INFO local_candidate{attempt=36}: retained faster incumbent candidate_cycles=11833505 cycles=11833505
2026-09-12T18:17:30.778120Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=37 before=11833505 after=11828137 changed_operations=[35] opened_boundaries=[380]
2026-09-12T18:17:31.754514Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: saved mid-plan search state path=artifacts/search-state-20260912/bs1/state.json attempts=38 bytes=20646931
2026-09-12T18:17:33.621441Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-0-480354-0056.json scope="local-38-candidate-0" peak_step=62 effective_peak_bytes=472824
2026-09-12T18:17:33.674250Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-1-480354-0057.json scope="local-38-candidate-1" peak_step=62 effective_peak_bytes=472824
2026-09-12T18:17:33.728657Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-2-480354-0058.json scope="local-38-candidate-2" peak_step=62 effective_peak_bytes=472824
2026-09-12T18:17:33.778353Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-3-480354-0059.json scope="local-38-candidate-3" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:17:33.826007Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-4-480354-0060.json scope="local-38-candidate-4" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:17:33.881875Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-5-480354-0061.json scope="local-38-candidate-5" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:17:33.930015Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-6-480354-0062.json scope="local-38-candidate-6" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:17:33.983603Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-7-480354-0063.json scope="local-38-candidate-7" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:17:34.032740Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-8-480354-0064.json scope="local-38-candidate-8" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:17:34.084820Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-9-480354-0065.json scope="local-38-candidate-9" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:17:34.149960Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-38-candidate-10-480354-0066.json scope="local-38-candidate-10" peak_step=72 effective_peak_bytes=462584
2026-09-12T18:17:34.150596Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=11 threads=24
2026-09-12T18:17:41.540348Z  INFO local_candidate{attempt=48}: screened exchange table geometry expansion_ms=6225 expansion_and_footprint_ms=7389 estimated_row_bytes=37816 heuristic_row_bytes=105960 geometry_fragments_per_tile=4335 fragment_limit=16384
2026-09-12T18:17:41.655998Z  INFO local_candidate{attempt=48}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:41.797072Z  INFO local_candidate{attempt=47}: screened exchange table geometry expansion_ms=6460 expansion_and_footprint_ms=7646 estimated_row_bytes=37640 heuristic_row_bytes=104812 geometry_fragments_per_tile=4317 fragment_limit=16384
2026-09-12T18:17:41.924678Z  INFO local_candidate{attempt=47}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:41.927613Z  INFO local_candidate{attempt=39}: screened exchange table geometry expansion_ms=6705 expansion_and_footprint_ms=7776 estimated_row_bytes=37544 heuristic_row_bytes=103296 geometry_fragments_per_tile=4301 fragment_limit=16384
2026-09-12T18:17:42.050263Z  INFO local_candidate{attempt=39}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:42.165187Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:42.174169Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:42.175542Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:42.176100Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:42.176110Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.176954Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:42.181924Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:42.181979Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:42.182846Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:42.182867Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.185140Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:42.185721Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:42.190314Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:17:42.192036Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:17:42.192070Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.192119Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:42.192579Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:42.192971Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:42.192991Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.194437Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:42.195234Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:42.196187Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:17:42.196215Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:42.200225Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:42.200976Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:42.200990Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.203307Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:42.212091Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:42.212506Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:42.212517Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.213583Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:42.217850Z  INFO local_candidate{attempt=46}: screened exchange table geometry expansion_ms=6890 expansion_and_footprint_ms=8067 estimated_row_bytes=37640 heuristic_row_bytes=104812 geometry_fragments_per_tile=4317 fragment_limit=16384
2026-09-12T18:17:42.220331Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:17:42.221055Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:17:42.221063Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.222731Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:17:42.228796Z  INFO local_candidate{attempt=48}: compared ordinary and paired exchange schedules phase=56 candidates=36 ordinary_horizon=232 paired_horizon=1392 use_paired=false
2026-09-12T18:17:42.253295Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:42.262089Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:42.264712Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:42.293498Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:42.297656Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:42.297669Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.303591Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:42.315045Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:42.315416Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:42.315425Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.316456Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:42.325100Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:17:42.327069Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:17:42.327081Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.329140Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:17:42.341294Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:42.341953Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:42.341967Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.343501Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:42.347000Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:17:42.347717Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:17:42.347729Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.349801Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:42.353133Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:42.353553Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:42.353563Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.354540Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:42.355424Z  INFO local_candidate{attempt=46}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:42.359245Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:42.363823Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:42.375979Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:42.376530Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:42.376540Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.378409Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:42.387786Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:42.395793Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:42.395821Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.406405Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:42.420974Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:42.436778Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:42.437387Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:17:42.437403Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.438694Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:17:42.445577Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:42.484685Z  INFO local_candidate{attempt=42}: screened exchange table geometry expansion_ms=7147 expansion_and_footprint_ms=8333 estimated_row_bytes=37704 heuristic_row_bytes=105600 geometry_fragments_per_tile=4323 fragment_limit=16384
2026-09-12T18:17:42.588307Z  INFO local_candidate{attempt=40}: screened exchange table geometry expansion_ms=7318 expansion_and_footprint_ms=8437 estimated_row_bytes=37544 heuristic_row_bytes=103296 geometry_fragments_per_tile=4301 fragment_limit=16384
2026-09-12T18:17:42.617350Z  INFO local_candidate{attempt=42}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:42.685506Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:17:42.705326Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:17:42.705352Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.713590Z  INFO local_candidate{attempt=40}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:42.720336Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:17:42.788853Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:42.802911Z  INFO local_candidate{attempt=45}: screened exchange table geometry expansion_ms=7362 expansion_and_footprint_ms=8652 estimated_row_bytes=37704 heuristic_row_bytes=105600 geometry_fragments_per_tile=4323 fragment_limit=16384
2026-09-12T18:17:42.816135Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:42.816161Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.841866Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:42.869252Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:42.871252Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:42.871268Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.873862Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:42.886634Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:17:42.900563Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:42.901555Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:17:42.901582Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.901867Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:42.917104Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:42.917141Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.920911Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:42.921435Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:42.921448Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.923179Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:42.923900Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:42.927730Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:17:42.934266Z  INFO local_candidate{attempt=45}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:42.936548Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:17:42.936575Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:42.942003Z  INFO local_candidate{attempt=44}: screened exchange table geometry expansion_ms=7549 expansion_and_footprint_ms=8791 estimated_row_bytes=37704 heuristic_row_bytes=105600 geometry_fragments_per_tile=4323 fragment_limit=16384
2026-09-12T18:17:42.947417Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:17:42.948443Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:17:42.948456Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:42.951130Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:17:42.951542Z  INFO local_candidate{attempt=43}: screened exchange table geometry expansion_ms=7532 expansion_and_footprint_ms=8800 estimated_row_bytes=37704 heuristic_row_bytes=105600 geometry_fragments_per_tile=4323 fragment_limit=16384
2026-09-12T18:17:42.957178Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:17:42.985254Z  INFO local_candidate{attempt=41}: screened exchange table geometry expansion_ms=7594 expansion_and_footprint_ms=8834 estimated_row_bytes=37624 heuristic_row_bytes=104736 geometry_fragments_per_tile=4319 fragment_limit=16384
2026-09-12T18:17:43.001387Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:17:43.008925Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:43.008960Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.014183Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:17:43.014541Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:43.014550Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.016181Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:17:43.017001Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:17:43.051368Z  INFO local_candidate{attempt=38}: screened exchange table geometry expansion_ms=7722 expansion_and_footprint_ms=8900 estimated_row_bytes=37544 heuristic_row_bytes=103296 geometry_fragments_per_tile=4301 fragment_limit=16384
2026-09-12T18:17:43.067841Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:43.074679Z  INFO local_candidate{attempt=44}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:43.084480Z  INFO local_candidate{attempt=43}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:43.104149Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:43.104174Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.117191Z  INFO local_candidate{attempt=41}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:43.147521Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:43.172773Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:43.181489Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:43.186040Z  INFO local_candidate{attempt=38}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:17:43.198911Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:43.198933Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.213652Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:43.213675Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.223055Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:43.255959Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:43.321616Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:17:43.321651Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:43.334482Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:17:43.392411Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:43.399745Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:43.402686Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:43.403387Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:43.403399Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.405151Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:43.405926Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:17:43.424495Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:43.426226Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:43.426249Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.430338Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:43.441519Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:43.441921Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:43.441929Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.442798Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:43.443264Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:43.443290Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.447361Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:43.451444Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:43.452552Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:43.453069Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:43.462711Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:43.466857Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:43.482023Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:17:43.495781Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:17:43.521833Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:43.521871Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.524477Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:43.528517Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:43.528532Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.535873Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:43.546756Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:43.547111Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:43.547118Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.547198Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:17:43.548049Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:43.570797Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:43.571467Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:43.571478Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.572913Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:43.786867Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:43.800607Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:43.800630Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.810826Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:43.837843Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:43.838975Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:43.839003Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:43.841072Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:44.057365Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:17:44.087682Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:44.091253Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:17:44.091282Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.099677Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:44.099704Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.118467Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:44.134882Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:17:44.178386Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:44.193377Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:17:44.205007Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:44.205047Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.235465Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:44.241839Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:17:44.241879Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.283472Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:17:44.296369Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:44.313012Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:44.313095Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.318220Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:44.321451Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:44.322334Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:44.322399Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.322645Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:44.324154Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:44.332057Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:17:44.332081Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:44.335986Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:44.336017Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.341625Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:44.342185Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:44.342195Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.343078Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:17:44.344407Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:44.351358Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:44.355418Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:44.355818Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:44.355826Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.356822Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:44.361601Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:44.365849Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:44.371805Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:44.392492Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:44.393971Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:44.393992Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.395948Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:44.482196Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:17:44.482247Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:44.494779Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:17:44.505793Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:17:44.525240Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:17:44.525279Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.560490Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:17:44.570546Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:44.570582Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:44.577406Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:17:44.585750Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:44.586350Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:44.586360Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.587613Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:44.627977Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:44.631989Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:17:44.641368Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:44.643517Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:44.643556Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.649340Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:17:44.649370Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:44.656055Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:17:44.657585Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:44.701707Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:44.701740Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.781146Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:44.800432Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:44.836431Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:44.844235Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:44.844273Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.844731Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:44.858345Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:44.858762Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:44.858770Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.860645Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:44.871308Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:44.874008Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:44.874470Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:44.874481Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.875593Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:44.881255Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:44.885186Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:44.885220Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.886113Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:44.887467Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:44.888099Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:44.894587Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:44.895648Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:44.898496Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:44.906023Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:44.923449Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:44.924347Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:44.924370Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.924615Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:44.924626Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.926787Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:44.938607Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:44.939539Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:44.952127Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:44.952145Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.955652Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:44.962392Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:44.962852Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:44.966794Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:44.966809Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.969240Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:44.969260Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.973815Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:17:44.973842Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:44.974845Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:44.977882Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:17:44.979334Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:44.982688Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:44.984429Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:44.984446Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.987927Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:44.988032Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:44.988487Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:44.988497Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.989678Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:44.989928Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:44.991071Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:44.991084Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.993352Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:44.995509Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:44.995961Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:44.996675Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:44.996691Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:44.998533Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:45.007038Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:45.008236Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:45.008250Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.010368Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:45.016600Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:45.017420Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:45.017432Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.019310Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:45.043772Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:45.043796Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.054097Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:45.070287Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:45.088915Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:45.088943Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.114709Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:45.114724Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:45.121092Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:17:45.121126Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:45.125547Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:45.148716Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:45.150942Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:17:45.152291Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:45.152310Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.157218Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:45.157235Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.168547Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:45.188321Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:45.218794Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:45.227462Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:45.227481Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.234790Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:45.238367Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:17:45.238399Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:45.238966Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:45.242256Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:17:45.243524Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:45.243540Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.255066Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:45.261841Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:17:45.266737Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:45.266756Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.272675Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:17:45.304363Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:45.311379Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:45.317283Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:45.327317Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:45.327344Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.340590Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:45.608449Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:45.612171Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:17:45.632796Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:45.632821Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.635154Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:45.635173Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.646263Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:17:45.648291Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:17:45.669010Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:45.696366Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:45.698522Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:45.698538Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.700767Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:17:45.701113Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:45.701866Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:17:45.701879Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.704458Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:17:45.710551Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:17:45.710573Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.720269Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:17:45.720950Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:17:45.720959Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.722514Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:17:45.755584Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:45.756262Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:45.759359Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:17:45.765814Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:45.772400Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:45.772436Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.775571Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:45.781001Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:45.781026Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.782284Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:45.789515Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:45.790001Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:45.790008Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.791278Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:45.806969Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:45.807010Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:45.808277Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:45.808311Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.812114Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:45.814314Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:17:45.830570Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:45.831102Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:45.831112Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.832270Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:45.837974Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:45.842865Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:45.846241Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:45.863276Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:17:45.863312Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.884260Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:17:45.903768Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:45.903794Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.912303Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:17:45.917561Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:17:45.934022Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:17:45.963267Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:45.965370Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:45.965384Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:45.967771Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:45.999238Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:17:45.999269Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.032953Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:17:46.041329Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:46.041360Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.048648Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:17:46.101812Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:17:46.122846Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:17:46.122882Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:46.135579Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:17:46.138716Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:46.165280Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:46.165307Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.198301Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:46.201763Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:46.218533Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:46.218567Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.233885Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:46.234979Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:46.239408Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:17:46.241277Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:17:46.241300Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.245105Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:17:46.260796Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:17:46.261462Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:17:46.261472Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.262938Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:17:46.263915Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:46.263935Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.275073Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:46.281525Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:46.283324Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:46.283346Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.285889Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:46.297227Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:46.301610Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:46.301630Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.307238Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:46.316663Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:46.327771Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:17:46.328831Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:17:46.328845Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.331355Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:17:46.334488Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:46.335969Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:46.346808Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:17:46.347538Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:17:46.347559Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.349167Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:17:46.362322Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:46.362343Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.365144Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:17:46.367607Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:17:46.367630Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=4 initial_horizon=496 selected_horizon=496 endpoint_lower_bound=288 lower_bound_gap=208 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:46.369888Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=4 tile=1431 row_words=13 horizon=496
2026-09-12T18:17:46.382893Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=5 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:46.382910Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=5 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:46.384014Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=5 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:46.385718Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:46.385737Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.393273Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:46.395433Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:46.399453Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:17:46.402843Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:46.425840Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:46.434857Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:17:46.436017Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:17:46.436032Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.438513Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:46.438641Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:17:46.447975Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:46.448456Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:46.448477Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.453936Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:17:46.454592Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:17:46.454601Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.454819Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:46.456081Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:17:46.456913Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:46.456930Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.459376Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:46.478749Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:46.499861Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:46.509402Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:46.514367Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:46.522392Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:46.522407Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.533492Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:46.600179Z  INFO local_candidate{attempt=48}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:17:46.608061Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:46.628646Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:46.628669Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.656884Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:46.672813Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:17:46.672891Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:46.711671Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:17:46.738483Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:46.739069Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:46.739078Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.740633Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:46.750764Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:17:46.777815Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:17:46.777855Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:46.794606Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:46.805235Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:17:46.805711Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:46.826409Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:17:46.826434Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.831274Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:46.831297Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.839645Z  INFO local_candidate{attempt=47}: compared ordinary and paired exchange schedules phase=34 candidates=6561 ordinary_horizon=7923 paired_horizon=6885 use_paired=false
2026-09-12T18:17:46.857817Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:46.882653Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:46.882685Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:46.901250Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:17:46.950728Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:17:46.950759Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:46.958256Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:17:46.965719Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:46.967915Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:46.967930Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:46.970869Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:46.983941Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:17:47.052438Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:47.074841Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:47.074870Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:47.103535Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:47.145576Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:47.145609Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:47.152315Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:17:47.281552Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:17:47.281595Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:47.369351Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:17:47.455894Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:47.492523Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:47.492554Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:47.527193Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:47.569288Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:17:47.569311Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:47.572491Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:17:47.606334Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:47.626099Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:47.632142Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:47.632170Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:47.635931Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:47.663311Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:47.946931Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:47.961266Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:47.961291Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:47.972801Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:48.003736Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:48.004952Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:48.004968Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.007339Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:48.169640Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:17:48.193688Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:48.193712Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.214641Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:17:48.250602Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:48.258995Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:48.259022Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.272250Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:48.272422Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:48.274568Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:48.274585Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.277933Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:48.346227Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:48.397004Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:48.397030Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.430880Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:48.430963Z  INFO local_candidate{attempt=47}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5710 paired_horizon=11269 use_paired=false
2026-09-12T18:17:48.467373Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:48.477469Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:48.477494Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.498624Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:17:48.498651Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:48.512558Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:48.514847Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:17:48.514877Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:48.531739Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:48.532433Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:48.532450Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.534428Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:17:48.534756Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:48.548540Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:48.548763Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:48.548942Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:48.548952Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.549942Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:48.557103Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:48.578825Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:48.579855Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:48.579873Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.582806Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:48.595647Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:48.611070Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:48.611553Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:48.611566Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.612573Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:17:48.613124Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:48.624050Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:48.624455Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:48.624468Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.625465Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:48.631080Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:48.645537Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:48.646118Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:48.646126Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.648279Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:48.702888Z  INFO local_candidate{attempt=46}: compared ordinary and paired exchange schedules phase=34 candidates=6561 ordinary_horizon=7923 paired_horizon=6885 use_paired=false
2026-09-12T18:17:48.719752Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:17:48.741932Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:48.741961Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:48.758392Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:17:48.806536Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:17:48.806570Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.815113Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:48.817199Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:48.817225Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.819768Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:48.959426Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:17:48.993831Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:48.995433Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:48.995872Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:48.995881Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:48.996787Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:49.001834Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:49.014199Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:49.014690Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:49.014699Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.016296Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:49.017807Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:49.019374Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:49.019416Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.028795Z  INFO local_candidate{attempt=41}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:17:49.057541Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:49.074575Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:49.074603Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.097704Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:17:49.097731Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:49.130864Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:17:49.141059Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:49.180733Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:49.194760Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:49.195174Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:49.195183Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.196646Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:49.206472Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:49.206821Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:49.206828Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.207767Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:49.212772Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:49.213979Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:17:49.214008Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:49.229353Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:49.230236Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:49.230298Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.233464Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:49.237781Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:17:49.271719Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:17:49.303973Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:49.304015Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.351047Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:17:49.398830Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:17:49.400325Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:17:49.400347Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.404622Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:17:49.430343Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:17:49.431668Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:17:49.431688Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.434242Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:17:49.463778Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:49.469477Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:17:49.478314Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:17:49.482252Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:17:49.487943Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:49.487964Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.490296Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:17:49.490315Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.492553Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:17:49.508027Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:17:49.511774Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:17:49.518229Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:49.537741Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:17:49.537783Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.540923Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:17:49.540956Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.577675Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:17:49.631838Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:17:49.646976Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:49.707417Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:49.707449Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.773792Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:49.808748Z  INFO local_candidate{attempt=42}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:17:49.815032Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:49.829428Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:49.829853Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:49.829862Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.831404Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:49.873607Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:17:49.873635Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:49.877051Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:49.877096Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:49.900298Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:17:49.913006Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:17:49.942779Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:17:49.943432Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:49.943442Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:49.944819Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:17:50.079254Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:17:50.079296Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:50.082790Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:17:50.264448Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:17:50.275253Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:17:50.275281Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.292657Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:17:50.301280Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:17:50.302320Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:50.331766Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:50.331790Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.338081Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:50.338106Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.382802Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:17:50.394173Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:50.397758Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:50.420428Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:17:50.421291Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:50.421313Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.423151Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:17:50.428923Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:50.428944Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.473560Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:50.485147Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:17:50.511442Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:17:50.511491Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.532290Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:17:50.547772Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:17:50.547806Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:50.550392Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:17:50.551886Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:50.552528Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:50.552540Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.554104Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:50.605080Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:50.610755Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:50.610777Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.617850Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:50.623671Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:50.627709Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:50.638130Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:50.638563Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:17:50.638572Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.639413Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:17:50.644109Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:50.672474Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:50.678083Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:50.678107Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.685496Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:50.695401Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:50.705981Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:50.706419Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:17:50.706430Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.707271Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:17:50.712020Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:50.713701Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:50.721797Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:50.735424Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:50.735835Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:50.735845Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.737441Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:50.740727Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:50.748117Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:50.748529Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:50.748539Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.749594Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:50.754897Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:50.759648Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:50.760919Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:50.761507Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:50.771797Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:50.772241Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:50.772264Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.815539Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:50.841464Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:50.845859Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:50.847556Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:50.847577Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.855597Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:50.868974Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:50.869433Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:50.869444Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.870583Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:50.882215Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:50.882238Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.900490Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:50.901406Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:50.901420Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.902951Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:50.926734Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:50.937779Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:17:50.958057Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:17:50.958083Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.974746Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:50.976087Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:17:50.979561Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:50.979577Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:50.985758Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:50.986665Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:50.994633Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:51.004245Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:51.004613Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:17:51.004620Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.005607Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:17:51.010112Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:51.027380Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:17:51.027946Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:51.027971Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.029866Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:17:51.045468Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:51.045497Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.053166Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:17:51.053197Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:51.056125Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=27 tile=1452 row_words=15 horizon=3578
2026-09-12T18:17:51.075598Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:17:51.087740Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:51.093242Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:51.093264Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.100087Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:51.104571Z  INFO local_candidate{attempt=46}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5710 paired_horizon=11269 use_paired=false
2026-09-12T18:17:51.109547Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:51.119802Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:51.120180Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:17:51.120187Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.120775Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:51.121025Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:17:51.125490Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:51.127033Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:51.134335Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:51.147220Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:51.147607Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:51.147613Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.149654Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:51.159811Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:51.160172Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:51.160178Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.161263Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:51.166164Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:51.170590Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:51.171762Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:51.172327Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:51.174708Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:17:51.174731Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:51.175896Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:51.182278Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:51.193187Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:51.194068Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:51.194092Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.196723Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:51.212220Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:51.212677Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:51.212687Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.213735Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:51.216874Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:17:51.219398Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:51.233470Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:51.234132Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:51.234142Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.234191Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:17:51.236396Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:51.254493Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:51.258608Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:51.258627Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.266213Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:51.279398Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:51.279820Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:51.279829Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.280977Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:51.307994Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:51.308852Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:51.308865Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.310367Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:51.324620Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:17:51.324650Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.351485Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:17:51.388102Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:51.388138Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.418500Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:51.425824Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:17:51.449149Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:17:51.449767Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:51.449778Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.451136Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:17:51.468961Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:51.468985Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.490777Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:17:51.511331Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:17:51.514941Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:17:51.514974Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.518904Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:17:51.553882Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:51.613528Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:51.635977Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:51.636717Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:51.636737Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.639234Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:51.655663Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:51.656340Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:51.656362Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.657884Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:51.666013Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:51.677450Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:51.680277Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:51.680829Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:51.680840Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.682802Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:51.691066Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:51.691086Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.698249Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:51.720833Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:51.721535Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:51.721549Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.723810Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:51.735282Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:17:51.735644Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:51.736079Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:51.736088Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.737243Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:51.742743Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:51.743976Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:17:51.744005Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:51.747361Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:51.748542Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:51.755571Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:51.768134Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:51.768542Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:51.768551Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.770128Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:51.776627Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:17:51.780268Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:17:51.780287Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.780674Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:51.781091Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:51.781102Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.782180Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:51.787735Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:51.792858Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:51.794738Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:51.795603Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:51.810518Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:51.826032Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:17:51.876691Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:51.881414Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:51.881433Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.889571Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:51.902978Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:51.903434Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:51.903444Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.904624Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:51.931001Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:51.932383Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:51.932408Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.934515Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:51.937758Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:17:51.962507Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:17:51.962536Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:51.975555Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:17:51.993078Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:17:51.993116Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:52.017586Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:17:52.033488Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:17:52.048326Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:17:52.048374Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:52.054441Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:52.054463Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.061903Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:17:52.063274Z  INFO local_candidate{attempt=48}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:17:52.072595Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:17:52.108987Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:52.122578Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:52.122601Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.129517Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:52.131750Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:17:52.142876Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:52.145671Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:52.145702Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.149283Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:52.150801Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:52.151426Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:52.151438Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.153952Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:52.165448Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:52.165868Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:52.165877Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.166930Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:52.172354Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:52.176870Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:52.177969Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:52.185238Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:52.197946Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:52.198340Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:52.198348Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.199736Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:52.209394Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:52.209758Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:52.209765Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.210723Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:52.215425Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:17:52.215461Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.217140Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:52.224428Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:52.226225Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:52.226987Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:52.232997Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:52.233066Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:52.240523Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:52.277730Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:17:52.282765Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:17:52.282800Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:52.302262Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:52.305659Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:17:52.306680Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:52.306696Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.310136Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:52.310779Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:52.310804Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.312048Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:52.314441Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:52.318061Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:17:52.318304Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:52.327113Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:52.327529Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:52.327538Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.328637Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:52.334531Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:52.335810Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:52.335836Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.339333Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:52.367592Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:52.368964Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:52.368984Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.371417Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:52.432946Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:17:52.458968Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:17:52.459055Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.479456Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:17:52.485417Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:17:52.485452Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:52.493867Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:17:52.528494Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:17:52.530661Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:17:52.530677Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.533277Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:17:52.649705Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:17:52.649746Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:52.674316Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:17:52.718330Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:52.730752Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:52.730782Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.737603Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:52.764493Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:52.765491Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:52.765512Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.768819Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:52.782187Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:52.782685Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:52.782698Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.783771Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:52.789317Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:52.793705Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:52.832068Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:17:52.832104Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:52.839349Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:17:52.909450Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:52.941940Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:52.941972Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.946659Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:52.954098Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:52.954132Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.960820Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:52.970443Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:52.973049Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:52.980274Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:52.980654Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:17:52.980662Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:52.981463Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:17:52.985738Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:52.988415Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:53.019290Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:53.019312Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.053957Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:17:53.058657Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:53.075153Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:53.090698Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:17:53.090724Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.114543Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:53.114567Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.128992Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:17:53.129414Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:53.141811Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:53.141834Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.148075Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:53.170366Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:53.170710Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:53.171257Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:53.171283Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.174292Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:53.188996Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:53.189445Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:53.189457Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.190472Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:53.190833Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:17:53.195727Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:53.200014Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:53.224629Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:53.224674Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.235086Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:17:53.257060Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:17:53.262141Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:53.262161Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.263396Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:17:53.263420Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.265119Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:17:53.268725Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:17:53.291262Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:17:53.292150Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:53.292189Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.294484Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:17:53.298029Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:17:53.337632Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:53.343053Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:53.343073Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.347659Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:53.349062Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:53.353170Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:53.353187Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.357757Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:53.360616Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:53.367047Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:53.367415Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:17:53.367425Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.368191Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:17:53.370864Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:53.372276Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:53.381530Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:53.381924Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:17:53.381932Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.382853Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:17:53.387608Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:53.389053Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:53.389459Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:53.396712Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:53.410537Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:53.410933Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:53.410942Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.412575Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:53.414430Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:17:53.414458Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:53.417111Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:17:53.422800Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:53.423179Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:53.423186Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.423954Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:53.423977Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.424301Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:53.430902Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:53.438997Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:53.441106Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:53.442125Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:53.456154Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:53.473386Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:53.473534Z  INFO local_candidate{attempt=47}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:17:53.508026Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-12T18:17:53.508056Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:53.510325Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:53.523102Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:53.527581Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:53.527606Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.535897Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:53.549018Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:53.549456Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:53.549468Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.550641Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:53.578520Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:53.579331Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:53.579344Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.581056Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:53.592009Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:53.592415Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:53.592448Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:53.592451Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:53.592476Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.593703Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:53.601703Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:53.608867Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:53.610769Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:17:53.619033Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:17:53.631075Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:17:53.631476Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:53.631487Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.633042Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:17:53.642705Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:17:53.643077Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:53.643085Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.644051Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:17:53.645039Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:17:53.649073Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:17:53.655131Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:17:53.656587Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:17:53.657265Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:17:53.667286Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:17:53.730079Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:17:53.731748Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:17:53.734108Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:17:53.734123Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.741475Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:17:53.759402Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:17:53.760068Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:17:53.760086Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.761917Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:17:53.790896Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:17:53.791735Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:17:53.791749Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.793526Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:17:53.811391Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:53.811419Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.827899Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:17:53.849940Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:17:53.849974Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.865850Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:17:53.913053Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:53.943452Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:17:53.963484Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:17:53.963513Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.964630Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:53.968349Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:53.980332Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:17:53.988526Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:53.988547Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.988725Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:53.988745Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:53.995291Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:54.011516Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:17:54.012521Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:54.012771Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:54.012784Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.014953Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:17:54.018134Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:54.031652Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:54.031674Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.079834Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:54.152929Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:17:54.157881Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:54.157901Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.162575Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:17:54.243853Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:54.257822Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:54.257846Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.269529Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:54.297993Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:54.298686Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:54.298699Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.300693Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:54.329780Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:17:54.347143Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:17:54.347170Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.361229Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:17:54.377137Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:17:54.377613Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:17:54.377623Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.378619Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:17:54.384094Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:17:54.396999Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:17:54.397579Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:17:54.397590Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.399508Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:17:54.418245Z  INFO local_candidate{attempt=42}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:17:54.542988Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:17:54.556776Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:17:54.556807Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.563000Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:54.563032Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:54.563874Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:17:54.565845Z  INFO local_candidate{attempt=45}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:17:54.584474Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:17:54.585083Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:17:54.585092Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.587135Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:17:54.598190Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:17:54.598608Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:17:54.598618Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.599682Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:17:54.606319Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:17:54.612653Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:17:54.614016Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:17:54.679876Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:17:54.693141Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:54.693177Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:54.739010Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:17:54.746603Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:54.746629Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.747150Z  INFO local_candidate{attempt=43}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:17:54.850188Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:54.869991Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:54.870023Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:54.897411Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:17:54.898323Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:17:54.898337Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:54.900766Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:54.916455Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:17:54.924814Z  INFO local_candidate{attempt=44}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:17:54.954440Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:54.980418Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:54.980454Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.024944Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:55.029337Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:55.047916Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:55.047945Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:55.068363Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:55.069516Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:17:55.069549Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:55.079566Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:55.079590Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.084603Z  INFO local_candidate{attempt=41}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:17:55.094278Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:17:55.094919Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:55.094941Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.101767Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:17:55.124843Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:55.148104Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:55.149629Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=30 tile=707 row_words=441 horizon=14541
2026-09-12T18:17:55.152304Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:17:55.152325Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.190682Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:55.200297Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:55.200323Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:55.205658Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:55.206121Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:55.206132Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.207666Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:55.225369Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:17:55.239938Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:55.254953Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:17:55.265868Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:55.265891Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.269981Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:17:55.284751Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:17:55.285158Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:17:55.285167Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.286591Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:17:55.295997Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:55.409365Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:55.443894Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:55.443924Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.473399Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:55.581812Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:55.607900Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:55.607925Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.615743Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:17:55.615776Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:55.640159Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:55.642828Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:17:55.787057Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:17:55.801828Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:17:55.801860Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:55.809601Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:17:55.831964Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:17:55.831987Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.837476Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:17:55.837506Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:55.850475Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:17:55.870455Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:17:55.885895Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:17:55.887892Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:17:55.887923Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:55.892739Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:17:56.041662Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:17:56.041702Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:56.074311Z  INFO local_candidate{attempt=46}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:17:56.080245Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:17:56.097533Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:17:56.100870Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:17:56.100900Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:56.113347Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:17:56.135036Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:17:56.135061Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.158232Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:17:56.158268Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:56.161054Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:17:56.180415Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:17:56.199644Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:56.199681Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:56.218851Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:17:56.229567Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:17:56.229588Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.246811Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:17:56.247470Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:17:56.317766Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:17:56.337762Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:17:56.340169Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:17:56.340186Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.342868Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:17:56.344969Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:56.344991Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.345867Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:17:56.351683Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:17:56.351700Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.359331Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:17:56.369450Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:17:56.380048Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:17:56.380507Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:17:56.380518Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.381438Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:17:56.382522Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:17:56.386181Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:17:56.404305Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:17:56.404773Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:56.404779Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.405991Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:17:56.481512Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:17:56.523251Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:17:56.523281Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.559429Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:17:56.568951Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:56.593430Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:56.593452Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.593592Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:17:56.594447Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:17:56.594462Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.597026Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:56.622017Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:56.673729Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:17:56.730538Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:17:56.730572Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.735477Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:17:56.756682Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:17:56.756704Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.772374Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:17:56.804305Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:17:56.805583Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:17:56.805597Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:56.808441Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:17:56.818373Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:17:56.865926Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:17:56.981941Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:17:56.981993Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:57.022723Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:17:57.024032Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:17:57.024063Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:57.055005Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:17:57.117607Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:17:57.117645Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:57.161553Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:17:57.203176Z  INFO local_candidate{attempt=42}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:17:57.230068Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:17:57.230104Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:57.245484Z  INFO local_candidate{attempt=41}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:17:57.245602Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:17:57.261338Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:17:57.276928Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:17:57.281906Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:17:57.281928Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:57.317926Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:17:57.317967Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:57.330733Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:17:57.359776Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:17:57.558006Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:17:57.566405Z  INFO local_candidate{attempt=44}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:17:57.597718Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:17:57.621720Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:17:57.621746Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:57.625588Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:57.625617Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:57.654727Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:17:57.672011Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:57.672045Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:57.704837Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:17:57.718611Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:17:57.718631Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:57.728821Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:57.736154Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:17:57.766485Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:57.801326Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:17:57.801360Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:57.811737Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:17:57.818347Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:17:57.827286Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:17:57.828610Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:17:57.828631Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:57.830711Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:17:57.832457Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:57.845520Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:17:57.845552Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:57.858064Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:17:57.896135Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:57.896170Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:57.937881Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:17:57.937916Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:57.982254Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:17:57.982288Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:57.993569Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:17:57.993828Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:17:57.994701Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:17:58.009155Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:58.060598Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:17:58.061491Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:58.061515Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:58.061534Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:17:58.061549Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:58.063790Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:58.180839Z  INFO local_candidate{attempt=42}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:17:58.180877Z  INFO local_candidate{attempt=42}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:58.183336Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:58.198461Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:17:58.220530Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:17:58.220552Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:58.238311Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:17:58.239538Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:17:58.239562Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:58.243275Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:58.244169Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:17:58.251836Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:17:58.276419Z  INFO local_candidate{attempt=42}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:17:58.290812Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:17:58.290852Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:58.327471Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:17:58.350633Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:17:58.382284Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:17:58.382317Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:58.413169Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:17:58.421868Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:17:58.469431Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:17:58.469461Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:58.508137Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:17:58.827180Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:17:58.860795Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:17:58.860820Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:58.902665Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:17:58.939135Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:17:58.939851Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:17:58.939867Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:58.941695Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:17:58.964672Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:17:58.990465Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:17:58.990490Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:59.016452Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:17:59.128268Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:17:59.137132Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=22 candidates=18 ordinary_horizon=2545 paired_horizon=2330 use_paired=false
2026-09-12T18:17:59.146659Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:17:59.146680Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:59.150642Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:17:59.155000Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:17:59.155020Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:59.171376Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:17:59.176423Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:17:59.176443Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:59.182383Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:17:59.189088Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:17:59.210387Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:17:59.210436Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=13 initial_horizon=12868 selected_horizon=12868 endpoint_lower_bound=11940 lower_bound_gap=928 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:59.263864Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:17:59.263907Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:59.267267Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-12T18:17:59.369846Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:17:59.395822Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:17:59.420454Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:17:59.421530Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:17:59.421550Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:59.423778Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:17:59.436937Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:17:59.436971Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:59.459923Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:17:59.459954Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:59.473912Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:17:59.517007Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:17:59.584248Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:17:59.584284Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:59.646476Z  INFO local_candidate{attempt=41}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:17:59.646533Z  INFO local_candidate{attempt=41}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:59.675330Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:17:59.739495Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:17:59.741652Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:17:59.741674Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:17:59.745947Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:17:59.754998Z  INFO local_candidate{attempt=41}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:17:59.958975Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:17:59.959072Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:17:59.978905Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:17:59.997998Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:18:00.040571Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:00.040607Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.040601Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:00.051545Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:00.051581Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:00.078884Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:18:00.116759Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:00.130032Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:00.131886Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:00.131911Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.143928Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:00.143951Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.178361Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:00.196611Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:00.214909Z  INFO local_candidate{attempt=39}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:18:00.233445Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:18:00.233477Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:00.240928Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:18:00.254421Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:18:00.254446Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:00.259581Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:00.259611Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.267574Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:18:00.277757Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:00.293352Z  INFO local_candidate{attempt=39}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:00.298260Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:00.305375Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:00.305398Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.307882Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:00.321529Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:00.327108Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:00.327127Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.333806Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:00.336139Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:00.336161Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.337427Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:00.368323Z  INFO local_candidate{attempt=44}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:00.374777Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:00.388011Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:00.388049Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:00.403378Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:00.403400Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.422763Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:18:00.441865Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:00.468236Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:00.468277Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:00.495153Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:00.497544Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:00.497560Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.500395Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:00.500530Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:18:00.535029Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:00.536121Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:00.536142Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.538428Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:00.567832Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:00.567867Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:00.580676Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:18:00.608959Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:00.610222Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:00.610239Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.612905Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:00.685666Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:00.695748Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:00.695769Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.712356Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:00.875448Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:00.898756Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:18:00.898786Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:00.913842Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:18:00.944245Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:00.983011Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:00.983035Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.000334Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:01.031029Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:01.038000Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:01.038031Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.073009Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:01.155767Z  INFO local_candidate{attempt=44}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:01.155805Z  INFO local_candidate{attempt=44}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:01.247429Z  INFO local_candidate{attempt=44}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:18:01.260695Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:01.260730Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:01.268538Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:01.268570Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:01.281833Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:18:01.287444Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:18:01.359598Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:01.399715Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:01.399763Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.444509Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:01.445116Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:18:01.445142Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:01.455743Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:18:01.467066Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:01.517569Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:01.537960Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:01.538003Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.557813Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:01.581925Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:01.581964Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.583924Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:01.590893Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:01.590911Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.593885Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:01.593903Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.617626Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:01.633472Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:01.634495Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:01.653721Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:01.671950Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:01.673084Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:01.673098Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.675592Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:01.676645Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:01.678815Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:01.678829Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.681146Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:01.689321Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:01.722285Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:18:01.722323Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:01.756497Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:01.756525Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.757566Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:01.757597Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:01.843197Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:01.843246Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:01.852096Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:01.857334Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:18:01.872538Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:18:01.875530Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:01.876016Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:01.876023Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.877345Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:01.877946Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:01.897701Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:01.898803Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:01.898823Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.901125Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:01.919236Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:01.929789Z  INFO local_candidate{attempt=46}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:01.945112Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:01.945146Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:01.952230Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:01.952260Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:01.987798Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:18:01.992600Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:02.002211Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:02.002243Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:02.051972Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:02.060970Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:02.081675Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:18:02.081697Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:02.093491Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:18:02.331799Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:02.342257Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:02.343886Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:02.343917Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:02.363688Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:02.363711Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:02.376972Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:18:02.385855Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:02.385877Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:02.400124Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:02.419079Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:02.499869Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:02.524877Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:02.524902Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:02.554162Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:02.623174Z  INFO local_candidate{attempt=39}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:02.623220Z  INFO local_candidate{attempt=39}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:02.680962Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:02.706260Z  INFO local_candidate{attempt=39}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:18:02.721863Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:02.740694Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:02.740719Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:02.769129Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:02.769167Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:02.789411Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:02.811660Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:02.949411Z  INFO local_candidate{attempt=43}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:18:03.005508Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:03.005547Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:03.031273Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:18:03.991168Z  INFO local_candidate{attempt=45}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:18:03.996479Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:04.055323Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:04.055350Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:04.066967Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:04.066991Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.080941Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:18:04.115422Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:04.181001Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:04.186134Z  INFO local_candidate{attempt=43}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:04.245906Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:04.245935Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.270604Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:04.270633Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.293999Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:04.428992Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:04.679303Z  INFO local_candidate{attempt=43}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:04.679340Z  INFO local_candidate{attempt=43}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:04.752332Z  INFO local_candidate{attempt=43}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:18:04.817769Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=35 success=true
2026-09-12T18:18:04.818719Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=39 success=true
2026-09-12T18:18:04.820766Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:18:04.823004Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-12T18:18:04.827250Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:04.831317Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:04.925356Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:04.927790Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:04.929248Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:04.934345Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:04.934825Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:04.934833Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:04.936163Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:04.936333Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:04.936768Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:04.936777Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.936916Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:04.936927Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.937177Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:04.937748Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:04.937762Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.938183Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:04.938368Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:04.938671Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:04.940734Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:04.941192Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:04.941215Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.941346Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:04.942800Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:04.943694Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:04.944719Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:04.945526Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:04.945941Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:04.945951Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.947481Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:04.953776Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:04.954334Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:04.954347Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.955842Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:04.956029Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:04.956719Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:04.957457Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:04.957477Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.957587Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:04.957600Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.960686Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:04.960990Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:04.961648Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:04.963637Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:04.963661Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.967920Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:18:04.982738Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:04.983552Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:04.983566Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.985328Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:04.994548Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:04.995654Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:18:04.995666Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.995936Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:04.996345Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:04.996355Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:04.996360Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:04.997390Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:04.997971Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:18:05.002416Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:05.006708Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:05.011978Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:05.016716Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:05.021589Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:05.026654Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:05.026666Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.026953Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:05.027436Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:05.027446Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.029388Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:05.033209Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:05.034309Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:05.050708Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:05.056159Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:05.056904Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:05.056922Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.059513Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:05.080781Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:05.086676Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:05.086695Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.093503Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:05.123637Z  INFO local_candidate{attempt=45}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:05.162473Z  INFO local_candidate{attempt=43}: exchange table and repeat patch storage exchange_table_bytes=28020 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:18:05.214770Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:05.214798Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.233141Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:18:05.233178Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:05.238535Z  INFO local_candidate{attempt=45}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:05.238567Z  INFO local_candidate{attempt=45}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:05.244824Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:18:05.257703Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:05.257731Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:05.270596Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:18:05.291621Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:05.299115Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:05.299293Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:05.299312Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.300997Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:05.301316Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:05.301332Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.302029Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:05.302041Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.302809Z  INFO local_candidate{attempt=44}: exchange table and repeat patch storage exchange_table_bytes=28020 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:18:05.304015Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:05.304595Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:05.308016Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:05.310845Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:05.316282Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:05.316311Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:05.326618Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:18:05.333794Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:05.333811Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.340568Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:18:05.363256Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:05.364660Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:05.364896Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:05.365516Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:05.365528Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.366937Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:05.366954Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.367015Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:05.369138Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:05.378966Z  INFO local_candidate{attempt=45}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:05.481803Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:05.486617Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:05.486638Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.491448Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:05.634639Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:05.662355Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:05.664605Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:05.667558Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:05.667593Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.672738Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:05.672753Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.688758Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:05.689951Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:05.689968Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.701466Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:05.714398Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:05.733964Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:05.747159Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:05.747184Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.754379Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:05.817469Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:05.832941Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:05.832964Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.846548Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:05.879989Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:05.881278Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:05.881293Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:05.883456Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:06.013688Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:06.043660Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:06.043696Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:06.050089Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:06.050112Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:06.083435Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:06.135505Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:18:06.159125Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:06.181911Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:06.181931Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:06.212850Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:06.226581Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:06.239731Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:06.243656Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:06.243678Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:06.262793Z  INFO local_candidate{attempt=46}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:06.262829Z  INFO local_candidate{attempt=46}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:06.263581Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:06.263600Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:06.272606Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:06.278286Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:06.341754Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:18:06.357280Z  INFO local_candidate{attempt=46}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:18:06.377714Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:18:06.377737Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:06.389338Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:18:06.923682Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:06.958912Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:06.958934Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:06.974453Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:06.974484Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:06.986965Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:07.005696Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:18:07.087182Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=60 success=true
2026-09-12T18:18:07.087241Z  INFO local_candidate{attempt=43}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=28020 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:18:07.087261Z  INFO local_candidate{attempt=43}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28020 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:07.207396Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:07.263552Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:07.263580Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.287018Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=61 success=true
2026-09-12T18:18:07.287068Z  INFO local_candidate{attempt=44}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=28020 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:18:07.287088Z  INFO local_candidate{attempt=44}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28020 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:07.316420Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:07.601188Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=513 success=true
2026-09-12T18:18:07.627036Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:07.628028Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:07.628051Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.630622Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:07.637393Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:07.638454Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:07.638469Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.641015Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:18:07.654520Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:07.656531Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:07.657144Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:18:07.657153Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.658574Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:18:07.658964Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:07.659926Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:07.659943Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.662214Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:07.684135Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:07.685513Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:07.685535Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.688650Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:07.724023Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:07.732854Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:07.765812Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:07.771866Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:07.774092Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:07.775949Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:07.775965Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.777802Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:07.781953Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:07.782315Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:07.782325Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.783579Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:07.787498Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:07.787806Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:07.787814Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.788486Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:07.791875Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:07.792179Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:07.792186Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.792657Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:07.792947Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:07.797509Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:07.799306Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:07.799334Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:07.803606Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:07.803631Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:07.804018Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:07.804032Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.805186Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:07.805421Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:07.805977Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:07.810110Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:18:07.819313Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:07.844371Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:07.844663Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:07.844925Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:07.844942Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.845011Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:07.845021Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.845847Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:07.846677Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:07.850608Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:07.854441Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:07.885268Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:07.886261Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:07.886280Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.888246Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:07.916692Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:07.920975Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:07.922835Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:07.922856Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.929542Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:07.929566Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.930453Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:07.935651Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:07.990251Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:07.990967Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:07.992896Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:07.992918Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:07.996032Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:08.004439Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:08.004461Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.011970Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:08.012387Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:08.012397Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.013468Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:08.024154Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:08.033663Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:08.066042Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:08.066072Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.069391Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:08.090232Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:08.090931Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:08.090948Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.093488Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:08.112320Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:08.119110Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:08.120328Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:08.120378Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.124565Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:08.124922Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:08.143196Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:08.143872Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:08.143885Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.144812Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:18:08.144840Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.145257Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:08.152298Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:08.155379Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:18:08.173422Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:08.178807Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:08.178830Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.184615Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:08.190016Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:08.338510Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:08.338550Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:08.369590Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:18:08.387350Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:08.403886Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:08.403928Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.417748Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:08.439988Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:08.441130Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:08.441144Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.443028Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:08.458259Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:08.482522Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:08.482814Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:08.489258Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:08.489283Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.493604Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:08.493623Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.499056Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:08.501418Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:08.501438Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.526337Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:08.529636Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:08.530269Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:18:08.530313Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:08.674108Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:18:08.756373Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:08.778336Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:08.778362Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:08.807266Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:08.861018Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:18:08.919977Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:08.920008Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:08.951455Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:18:08.951739Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:08.959582Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:08.986720Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:08.986744Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:09.023718Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:09.024501Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:09.024529Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:09.038894Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:09.053025Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:09.053068Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:09.066841Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:09.066878Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:09.080710Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:09.114701Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:09.118597Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:09.140712Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:09.140736Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:09.153368Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:18:09.158266Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:09.322882Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:09.348677Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:09.348701Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:09.385804Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:09.546262Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:09.638775Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:09.647326Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:09.647346Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:09.653881Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:09.653906Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:09.665221Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:09.750333Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:09.878924Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:09.950530Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:09.950560Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:09.979148Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:09.979185Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:10.009938Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:10.012102Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:10.340510Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:10.367901Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:10.404617Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:10.404643Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:10.464516Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:10.480014Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:10.480049Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:10.542409Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:10.874001Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:10.909451Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:10.909490Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:10.954761Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:10.979111Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:11.043613Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:11.043648Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:11.151527Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:11.297115Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:18:11.297147Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:11.303984Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:18:11.403478Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:18:11.474772Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:11.474808Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:11.501300Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:18:11.560450Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:11.600752Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:11.600775Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:11.638884Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:11.958229Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:12.036968Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:12.037004Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:12.073229Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:12.929788Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:12.966019Z  INFO local_candidate{attempt=40}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:18:13.028917Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:13.028944Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.049773Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:13.049850Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:13.084874Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:13.084905Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:13.129010Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:13.129133Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:18:13.214594Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:13.267881Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=25 success=true
2026-09-12T18:18:13.269376Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=26 success=true
2026-09-12T18:18:13.270396Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=25 success=true
2026-09-12T18:18:13.270861Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:18:13.272529Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:18:13.273372Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:18:13.273515Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=31 success=true
2026-09-12T18:18:13.276412Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:18:13.276553Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:13.278725Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:13.279092Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:13.282292Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:13.405846Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:13.411863Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:13.412268Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:13.412278Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.413183Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:13.416584Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:13.417663Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:13.417900Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:13.418588Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:13.418606Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.420244Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:13.428431Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:13.428893Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:13.429343Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:13.429354Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.429663Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:13.429676Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.430783Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:13.432559Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:18:13.434970Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:13.435529Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:13.435544Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.438389Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:13.444335Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:13.449289Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:13.449988Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:18:13.449996Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.451827Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:18:13.453600Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:13.454086Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:13.454095Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.455618Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:13.458541Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:13.459075Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:13.463069Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:13.469506Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:13.471258Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:13.472034Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:13.477866Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:13.478524Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:13.479292Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:13.479304Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.482213Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:13.544621Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:13.549662Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:13.549692Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.554136Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:13.558988Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:13.570802Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:13.571274Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:13.571288Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.573167Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:13.576542Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:13.577121Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:13.577134Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.578721Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:13.613354Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:13.615471Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:13.616721Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:13.616738Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.618761Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:13.627529Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:13.633887Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:13.633904Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.634942Z  INFO local_candidate{attempt=45}: exchange table and repeat patch storage exchange_table_bytes=28020 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:18:13.635151Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:13.641018Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:13.641086Z  INFO local_candidate{attempt=39}: exchange table and repeat patch storage exchange_table_bytes=27472 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:18:13.642880Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:13.642898Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.654019Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:13.663091Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:13.669571Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:13.670025Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:13.670034Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.670214Z  INFO local_candidate{attempt=41}: exchange table and repeat patch storage exchange_table_bytes=28068 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:18:13.671095Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:13.676645Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:13.687661Z  INFO local_candidate{attempt=47}: exchange table and repeat patch storage exchange_table_bytes=28100 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:18:13.689337Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:13.689779Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:13.689786Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.691077Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:13.721904Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=22 candidates=18 ordinary_horizon=2545 paired_horizon=2362 use_paired=false
2026-09-12T18:18:13.724771Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:13.724802Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.730441Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:13.730458Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:13.733348Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:13.739506Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:13.765487Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:13.765506Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.788604Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:13.788645Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:13.796126Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:13.811962Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:13.816409Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:18:13.870881Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:13.871330Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:13.871342Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.872881Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:13.880345Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:13.881743Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:13.882137Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:13.882149Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.884256Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:13.887158Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:13.901406Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:13.901441Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:13.918144Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:18:13.938976Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:13.939766Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:13.939787Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:13.942737Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:13.959628Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:18:13.959660Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:13.970628Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:18:14.241065Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:14.251600Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:14.251621Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.266141Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:14.266950Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:14.294061Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:14.295060Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:14.295075Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.297764Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:14.301318Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:14.301347Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.315638Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:14.340284Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:14.340813Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:14.340833Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.372795Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:14.404646Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:14.425233Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:14.425257Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.431071Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:14.436060Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:14.436078Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.441466Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:14.446075Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:14.465717Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:14.481575Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:14.481605Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.517993Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:14.550868Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:14.561772Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:14.562779Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:14.562795Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.568761Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:14.623348Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:14.623388Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.669321Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:14.669501Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:14.703106Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:14.703132Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.725932Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:18:14.733356Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:14.746533Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:14.759179Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:18:14.759232Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:14.773090Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:18:14.774790Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:14.774813Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:14.790053Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:15.438249Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:15.480979Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:15.481006Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:15.496718Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:15.496756Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:15.515090Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:15.537736Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:18:15.690356Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:15.725341Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=154 success=true
2026-09-12T18:18:15.725343Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=149 success=true
2026-09-12T18:18:15.725354Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=242 success=true
2026-09-12T18:18:15.725383Z  INFO local_candidate{attempt=41}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10008 exchange_table_bytes=28068 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:18:15.725416Z  INFO local_candidate{attempt=39}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10068 exchange_table_bytes=27472 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:18:15.725404Z  INFO local_candidate{attempt=45}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=28020 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:18:15.725427Z  INFO local_candidate{attempt=41}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28068 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10008 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:15.725432Z  INFO local_candidate{attempt=39}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27472 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10068 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:15.725433Z  INFO local_candidate{attempt=45}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28020 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:15.749097Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:15.749127Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:15.814911Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:15.867452Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:15.884890Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=82 success=true
2026-09-12T18:18:15.884930Z  INFO local_candidate{attempt=47}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10008 exchange_table_bytes=28100 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:18:15.884943Z  INFO local_candidate{attempt=47}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28100 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10008 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:15.941471Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:15.941499Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:15.996646Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:16.288037Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=562 success=true
2026-09-12T18:18:16.291518Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:16.300131Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=574 success=true
2026-09-12T18:18:16.301318Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:16.301888Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:16.301897Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:16.303497Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:16.303833Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:16.304232Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:16.308304Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=582 success=true
2026-09-12T18:18:16.309593Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:16.314900Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:16.316015Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:16.316029Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:16.318605Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:18:16.322409Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:16.323078Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:16.323090Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:16.325357Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:16.339335Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:16.340601Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:18:16.340619Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:16.341360Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:16.342071Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:16.342163Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:16.343450Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:18:16.343984Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:16.352831Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:16.359649Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:16.359981Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:16.361694Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:16.362483Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:16.390011Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=505 success=true
2026-09-12T18:18:16.391891Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:16.394581Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:16.394610Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:16.395354Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:16.396810Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:16.396828Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:16.403363Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:16.405284Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:16.415865Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:16.416267Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:16.416277Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:16.417400Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:16.440539Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:16.443035Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:16.443788Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:16.443801Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:16.445439Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:16.471903Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:18:16.486296Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:18:16.486323Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:16.502900Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:18:16.926596Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:16.938596Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:16.974176Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:16.974222Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.000978Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:17.001010Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.001069Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:17.057113Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:17.070588Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:17.070610Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.080916Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:17.094054Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:17.107039Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:17.108059Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:17.108079Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.108243Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:17.109969Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:17.123593Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:17.123624Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.135754Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:17.137945Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:17.149917Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:17.151266Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:17.151286Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.155489Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:17.155505Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.155942Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:17.160001Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:17.161000Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:17.161013Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.161548Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:17.161649Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:17.162773Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:17.168576Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:17.168605Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:17.169631Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:17.169655Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.170474Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=53 success=true
2026-09-12T18:18:17.173503Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:18:17.175401Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:17.179544Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:17.180148Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:17.186803Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:17.188282Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:17.188309Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.189265Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:17.189293Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.191334Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:17.200496Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:18:17.200945Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:17.213993Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:17.215049Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:17.215065Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.216939Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:17.227154Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:17.227789Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:17.227802Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.230010Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:17.241281Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:17.241713Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:17.241721Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.242849Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:17.248093Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:17.250180Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:17.252850Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:17.264136Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:17.264579Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:17.264589Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.265959Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:17.272392Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:17.285242Z  INFO local_candidate{attempt=40}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:17.291734Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:17.291753Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.303774Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:17.326112Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:17.334508Z  INFO local_candidate{attempt=38}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:17.335693Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:17.335705Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.338432Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:17.354144Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:17.354188Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.366364Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:17.374139Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:17.374161Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.385510Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:17.398455Z  INFO local_candidate{attempt=40}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:17.398488Z  INFO local_candidate{attempt=40}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.436874Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:17.439803Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:17.442637Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:17.444818Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:17.444838Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.447693Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:17.447710Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.450574Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:17.450591Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.456219Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:17.458621Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:17.461728Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:17.461800Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:17.464274Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:17.480870Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:17.480895Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.491684Z  INFO local_candidate{attempt=40}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:17.494054Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:17.495407Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:18:17.495438Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:17.536700Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:17.538703Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:17.538719Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.541216Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:17.560265Z  INFO local_candidate{attempt=42}: exchange table and repeat patch storage exchange_table_bytes=28020 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:18:17.582093Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:17.620894Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:17.620931Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.647716Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:18:17.658802Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:17.684766Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:17.685339Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:17.685351Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.686774Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:17.728463Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:17.728497Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:17.742282Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:18:17.762381Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:17.763056Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:17.763069Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.764737Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:17.772848Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:17.781120Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:18:17.783450Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:17.786737Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:17.786759Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.787927Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:17.788809Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:17.788829Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.790215Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:17.791990Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:17.840544Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:17.854613Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:17.854653Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:17.870930Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:17.870976Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:17.874005Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:17.874025Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.893056Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:18:17.911322Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:17.926184Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:17.954927Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:17.955638Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:17.955651Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:17.957242Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:17.961327Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:17.967457Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:18:17.988820Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:17.988853Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.007167Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:18.015348Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:18.060149Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:18.060185Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:18.111934Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:18.159009Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:18.171059Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=31 success=true
2026-09-12T18:18:18.174155Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:18:18.175118Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:18.179942Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:18.179962Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.180687Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:18.180710Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.180730Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:18.187387Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:18.208564Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:18.294621Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:18.318147Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:18.342511Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:18.342551Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.345413Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:18:18.345446Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.361510Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:18:18.375356Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:18.391976Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:18.393861Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:18.394474Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:18.394485Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.395928Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:18.408690Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:18.408719Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.443185Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:18.443409Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:18.455326Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:18.471662Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:18.472286Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:18.473233Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:18.473245Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=496 selected_horizon=496 endpoint_lower_bound=288 lower_bound_gap=208 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.476727Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=1431 row_words=13 horizon=496
2026-09-12T18:18:18.478171Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:18.485677Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:18.485710Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.488542Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:18.488950Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:18.488958Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.490089Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:18.498167Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:18.498193Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.512893Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:18.512927Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.535686Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:18.540657Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:18.543932Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:18.553430Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:18.554491Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:18.582472Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:18.584171Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:18.584193Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.588340Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:18:18.588845Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:18.590232Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:18:18.590245Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.593344Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:18:18.603180Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:18.603432Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:18.612058Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:18.612090Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:18.613431Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:18.614718Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:18:18.614742Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.617178Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:18:18.622278Z  INFO local_candidate{attempt=48}: exchange table and repeat patch storage exchange_table_bytes=28052 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:18:18.633389Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:18.633423Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:18.635087Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:18.635117Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.638473Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:18:18.652889Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:18.667782Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:18.675870Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:18.679244Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:18.679875Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:18.689523Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:18.719488Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:18.741691Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:18.741723Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.756270Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:18.818768Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:18.818826Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:18:18.818852Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:18.821095Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:18.821111Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.824283Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:18.827264Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:18:18.881474Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:18.887185Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:18.887227Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.894492Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:18.907790Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:18.918192Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:18.918607Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:18.918616Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.919604Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:18.924230Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:18.925828Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:18.932582Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:18.948079Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:18.948798Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:18.948851Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.951411Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:18.966140Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:18.966550Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:18.966561Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:18.967619Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:18.972710Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:18.977197Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:18.978421Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:18.978969Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:18.989362Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:19.044536Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:19.079562Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:19.079614Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.080837Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:19.085117Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:19.085155Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.093083Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:19.106567Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:19.106620Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:19.107012Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:19.107022Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.108246Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:19.124990Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:19.135020Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:19.135866Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:19.135880Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.137255Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:19.137282Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.137619Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:19.163351Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:19.188071Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:19.219825Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:19.219864Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.244571Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:19.332473Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:19.343435Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:19.343465Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.349986Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:19.365914Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:19.387059Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:19.387086Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.396979Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:19.401718Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:19.401742Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.405635Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:19.406958Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:18:19.458625Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:19.462014Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:19.462084Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.467192Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:19.516581Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:19.527297Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:19.552579Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:19.552604Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.554504Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:19.554526Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.582113Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:19.602797Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:19.644616Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:19.645587Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:19.645601Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.648415Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:19.659003Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:19.659407Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:19.659419Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.660861Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:19.669068Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:19.690166Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:19.691042Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:19.691060Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.694170Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:19.807516Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:19.808514Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:19.837183Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:19.837231Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.839741Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:19.859022Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:18:19.902454Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:18:19.902491Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.913891Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:19.913925Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.922604Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:19.924819Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:19.924837Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:19.927539Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:19.968068Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:19.979408Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:19.993375Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:19.993407Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.000883Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:20.032399Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:20.033481Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:20.033504Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.037784Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:20.040259Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:18:20.056745Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:20.057455Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:20.057478Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.059306Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:20.068183Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:20.075599Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:20.077383Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:20.088372Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:20.090687Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:20.091715Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:20.091736Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.094520Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:20.105748Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:20.107411Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:20.107993Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:20.108007Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.110493Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:20.125530Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:20.126027Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:20.126038Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.127217Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:20.134748Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:20.141472Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:20.143248Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:20.144020Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:20.150324Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:20.176261Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:20.182891Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:20.184017Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:20.187891Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:20.187916Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.194054Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:20.194484Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:20.194495Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.195876Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:20.196084Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:20.203511Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:20.203541Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.207712Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:20.207730Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.209827Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:20.210244Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:20.210256Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.211280Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:20.227695Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:20.236770Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:20.237876Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:20.237897Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.239535Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:20.239564Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:20.244660Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:20.247326Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:20.247970Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:20.247985Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.250451Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:20.263308Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:20.263697Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:20.263706Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.264637Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:20.271142Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:20.274420Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:20.291022Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:20.291817Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:20.291852Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.295526Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:20.323637Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:20.323672Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.430477Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:20.496310Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=917 success=true
2026-09-12T18:18:20.496369Z  INFO local_candidate{attempt=42}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=9988 exchange_table_bytes=28020 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:18:20.496389Z  INFO local_candidate{attempt=42}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28020 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9988 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:20.629169Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:20.654378Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:20.654405Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.664593Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:20.673851Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:20.673873Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.689465Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:20.695887Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:20.718778Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:20.719322Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:20.719336Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.720434Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:20.725695Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:20.730180Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:20.931094Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:18:20.963362Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:20.963399Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:20.996288Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:18:21.035814Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:21.049045Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:21.049082Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.056763Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:21.076633Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:21.077274Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:21.077287Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.079144Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:21.132856Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:21.206099Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:21.206138Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.207743Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:18:21.273167Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:21.273223Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:21.303347Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:18:21.303848Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:21.315555Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:21.329917Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:21.329967Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.352948Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:21.353699Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:21.367578Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:21.368090Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:21.368100Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.369852Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:21.381386Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:21.381806Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:21.381815Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.382737Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:21.387676Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:21.435402Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:21.453756Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=870 success=true
2026-09-12T18:18:21.453807Z  INFO local_candidate{attempt=48}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=9948 exchange_table_bytes=28052 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:18:21.453822Z  INFO local_candidate{attempt=48}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=28052 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9948 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:21.472489Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:21.472511Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.494092Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:21.503654Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:21.503692Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.514714Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:21.526843Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:21.535087Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:21.540727Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1044 success=true
2026-09-12T18:18:21.653381Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:21.712421Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:21.712459Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.780156Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:21.830059Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:21.831521Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:21.831552Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.835763Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:21.881242Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:21.912777Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:21.912820Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:21.935900Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:21.935941Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:21.954017Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:22.002355Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:22.038857Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:22.038888Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.039340Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:22.082386Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:22.123036Z  INFO local_candidate{attempt=38}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:18:22.206888Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:22.246223Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:22.251935Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:22.251960Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.258871Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:22.261146Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5680 paired_horizon=11275 use_paired=false
2026-09-12T18:18:22.267808Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:22.267838Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.268563Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:22.273035Z  INFO local_candidate{attempt=38}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:22.273073Z  INFO local_candidate{attempt=38}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:22.279291Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:22.279693Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:22.279703Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.280693Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:22.285100Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:22.327052Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:22.327088Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5680 selected_horizon=5680 endpoint_lower_bound=4656 lower_bound_gap=1024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:22.333805Z  INFO local_candidate{attempt=38}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:18:22.353589Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:22.356108Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=344 horizon=5680
2026-09-12T18:18:22.359182Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:22.367273Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:22.367305Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.382407Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:22.383416Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:22.401377Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:22.402349Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-12T18:18:22.402370Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.404929Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:22.412653Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:22.412690Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.420853Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:22.421566Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:22.421586Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.423631Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:22.425582Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:22.427088Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:22.427129Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.430644Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:22.459731Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:22.483839Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:22.485722Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:22.486248Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:22.486258Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.487586Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:22.490432Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1036 success=true
2026-09-12T18:18:22.539566Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:22.541848Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:22.541862Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.544377Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:18:22.637032Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:22.650660Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:22.669699Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:22.677785Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:22.677812Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.691329Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:22.711505Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:22.711556Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.713608Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:22.713651Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.717453Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:22.733384Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:22.733419Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.751718Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:22.805898Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:22.816872Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:22.849032Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:22.869717Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:22.870187Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:22.870198Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.871780Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:22.873234Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:22.874260Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:22.874274Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.876720Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:22.882074Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:22.882467Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:22.882477Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.883550Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:22.888775Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:22.902903Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:22.903453Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:22.903465Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:22.905562Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:22.966544Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:22.967448Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:22.967479Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:22.971807Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:22.996354Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:18:22.996400Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.003395Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:18:23.010447Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:18:23.041102Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:23.041138Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.147571Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:18:23.177101Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:23.177611Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:18:23.177643Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:23.186065Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:18:23.289478Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:23.289522Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.362840Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:23.381570Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:23.381601Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.392691Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:23.421579Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:23.422754Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:23.422768Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.424747Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:23.489818Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:23.522025Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:18:23.544545Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:23.545661Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:23.545676Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.548276Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1452 row_words=15 horizon=3578
2026-09-12T18:18:23.583863Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:23.583893Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:23.621485Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:18:23.674779Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:23.694362Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:23.700644Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:23.700671Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.702828Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:23.711641Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:23.711664Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.728267Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:23.734653Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:23.740343Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:23.740673Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:23.742888Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:23.742923Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.768626Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:23.768655Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.787257Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:23.796194Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:23.803818Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:23.813503Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:23.813534Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.827102Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:23.827133Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.836478Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:23.837289Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:23.837699Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:23.837714Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.840429Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:18:23.850322Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:23.852663Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:23.852695Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:23.856523Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:23.857304Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:18:23.857315Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.859295Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:18:23.860278Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:23.872930Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:23.872980Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.879178Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:23.879224Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.886774Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:23.891091Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:23.891952Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:23.891971Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.897099Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:23.900514Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:23.913516Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:23.913858Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:23.920099Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:23.923977Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:23.939414Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:23.939924Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:23.939934Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.941502Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:23.952585Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:23.957913Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:23.960278Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:23.960297Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:23.964069Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:23.996147Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:23.996705Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:23.996780Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.002062Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:24.005559Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:24.005613Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.009631Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:24.013860Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:24.013887Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.037997Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:24.038038Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:24.067712Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:24.067748Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:24.080701Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:24.081327Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:24.081345Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.082029Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=452 row_words=53 horizon=8353
2026-09-12T18:18:24.082782Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:24.098980Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:24.133923Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:24.136305Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:24.136326Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.138788Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:24.142003Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:24.178099Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:24.178135Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.283418Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:24.307070Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:24.323486Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:24.324135Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:24.324145Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.325497Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:24.369513Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:24.369543Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.394247Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:24.458997Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:24.459035Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.470367Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:24.498167Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:24.523071Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:18:24.523114Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.541066Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:24.541755Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:18:24.565770Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:18:24.589027Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:24.596329Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:24.608567Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:24.608959Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:24.608968Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.610958Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:24.619517Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:24.619552Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.620869Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:24.621077Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:24.621101Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:24.621250Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:24.621259Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.622329Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:24.627466Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:24.631919Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:24.633115Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:24.633690Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:24.644119Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:24.649880Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:24.653477Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:18:24.663043Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:24.679963Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:24.689325Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:24.689351Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.695020Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:24.695053Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.713714Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:24.717637Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:24.717661Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.720329Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:24.725752Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:24.739225Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:24.739687Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:24.739697Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.740897Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:24.742528Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:24.772335Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:24.773282Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:24.773295Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.775457Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:24.798059Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:24.827482Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:18:24.827528Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:24.833506Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:24.833545Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.839884Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:18:24.869539Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:24.904471Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:24.906472Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:24.906499Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.910834Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:18:24.930765Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:24.931545Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:18:24.931557Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.933289Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:18:24.957160Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:24.963526Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:24.963549Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.971188Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:24.979822Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:24.982265Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:24.990523Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:24.993107Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:24.993532Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:24.993542Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:24.994410Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:24.999178Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:25.157635Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:25.197842Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:25.197885Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:25.236367Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:25.449794Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:25.470554Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:25.470580Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:25.484120Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:25.485348Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:25.535375Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:25.535764Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:25.537602Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:25.537619Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:25.540363Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:25.549718Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:25.549746Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:25.557488Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:25.588282Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:25.589305Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:25.589327Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:25.591740Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:25.603761Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:25.604225Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:25.604236Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:25.605377Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:25.611015Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:25.615831Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:25.626904Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:25.626940Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:25.692995Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:25.704599Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:25.746802Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:25.746848Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:25.768113Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:25.768157Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:25.793393Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:25.799144Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:25.799179Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:25.815828Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:18:25.817339Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:25.897292Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:25.915725Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:25.958453Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:25.958491Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:25.965599Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:25.965632Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:25.975893Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:25.975940Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:26.001192Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:26.011364Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:18:26.029117Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:26.052071Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:26.060529Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:26.074615Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:26.075122Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:26.075134Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.077313Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:26.087849Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:26.088286Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:26.088297Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.089406Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:26.094888Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:26.099933Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:26.101888Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:26.102737Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:26.136647Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:26.153784Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:26.153820Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:26.187143Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:26.189219Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:26.190079Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:18:26.190102Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:26.200297Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:26.200317Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.201489Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:18:26.208054Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:26.212397Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:26.212414Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.218056Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:26.220276Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:26.240333Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:26.241012Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:26.241029Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.242891Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:26.258051Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:26.260509Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:26.271723Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:26.272555Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:26.272576Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.274069Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:26.284924Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:26.284952Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.293915Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:26.293936Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.313672Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:26.332236Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:26.524093Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:26.534678Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:26.567666Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:26.567702Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.570327Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:26.570359Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.595430Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:26.605803Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:26.671000Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:26.671038Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:26.690377Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:26.743758Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:26.743797Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.749803Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:26.755187Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:26.755224Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.755301Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:26.760511Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:26.816146Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:26.816184Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:26.820142Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:26.829869Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:18:26.829873Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:26.846160Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:26.846702Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:26.846715Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.847905Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:26.853664Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:26.858345Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:26.861536Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:26.863269Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:26.863291Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.876334Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:26.876758Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:26.876767Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.878312Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:26.888510Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:26.888871Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:26.888879Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.889862Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:26.894982Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:26.900008Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:26.910911Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:26.911868Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:26.911890Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.914477Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:26.915039Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:26.918018Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:26.918044Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.922534Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:26.932905Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:26.933472Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:26.933484Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.934825Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:26.937332Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:26.943910Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:26.956072Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:26.956498Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:26.956510Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.958187Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:26.968680Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:26.969059Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:26.969070Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:26.970120Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:26.975366Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:26.980183Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:26.981529Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:26.982143Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:26.988865Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:26.992515Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:27.064524Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:27.064543Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:27.064574Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12868 selected_horizon=12868 endpoint_lower_bound=11940 lower_bound_gap=928 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.070539Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:27.070571Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.079288Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:27.092977Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:27.093421Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:27.093434Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.094594Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:27.094772Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:27.109323Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:27.109349Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.117153Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:27.117711Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-12T18:18:27.125563Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:27.126625Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:27.126650Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.128738Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:27.140619Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:27.141624Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:27.141649Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.145525Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:27.149317Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:27.149836Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:27.149844Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.150992Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:27.156447Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:27.170032Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:27.170591Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:27.171158Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:27.171166Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.171166Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:27.171179Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.173384Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:27.173940Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:27.208633Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:27.209905Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:27.209920Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.212719Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:18:27.322560Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:27.347022Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:18:27.347069Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.362260Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:18:27.441718Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:27.476937Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:27.524675Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:27.524714Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.547783Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:27.563712Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:27.584425Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:27.584462Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:27.625686Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:18:27.635422Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:27.636263Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:27.636288Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.637095Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:27.677674Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:27.689392Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:27.689428Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:27.697631Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:27.712585Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:27.713079Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:27.713089Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.714919Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:27.715654Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:18:27.740819Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:27.747137Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:27.747159Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.754112Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:27.764048Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:27.774476Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:27.774868Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:27.774875Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.775709Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:27.780321Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:27.783107Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:27.783144Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:27.800478Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:27.800510Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:27.807902Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:27.836786Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:27.856962Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:27.915274Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:27.929918Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:27.929953Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.937666Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:27.959761Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:27.960458Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:27.960473Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.962866Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:27.975226Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:27.975715Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:27.975728Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:27.976903Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:27.982583Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:27.987302Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:28.033125Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:28.038497Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:28.038519Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.045696Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:28.055264Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:28.065109Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:28.065511Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:28.065521Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.066360Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:28.071033Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:28.078854Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:28.092511Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:28.093378Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:28.093391Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.096499Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:28.106836Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:28.106857Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.139374Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:28.171844Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:28.172649Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:28.186733Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:28.190866Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:28.190917Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:28.207071Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:28.207107Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.220942Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:28.220978Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.231879Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:28.231930Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.233808Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:28.233840Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:28.236471Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:28.252003Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:28.267607Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:28.276945Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:28.282599Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:28.283430Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:28.283445Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.286070Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:28.313740Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:28.315763Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:28.315801Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.319669Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:28.335237Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:28.359806Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:28.359840Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:28.374261Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:18:28.380063Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:28.382436Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:28.382455Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.385231Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:28.390645Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:28.391128Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:28.391135Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.392811Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:28.397019Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:28.455681Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:28.461563Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:28.461608Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.541061Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:28.541102Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.566480Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:28.613192Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:28.620080Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:28.656670Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:28.657005Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:28.657030Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.660902Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:28.660932Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.676422Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:28.685839Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:28.685862Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.703145Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:28.707240Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:28.710002Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:28.751242Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:28.752863Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:28.752942Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.757612Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:28.805658Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:28.829384Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:18:28.829422Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:28.842860Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:18:28.917812Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:28.917851Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:28.923704Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:18:28.923736Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:28.929628Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:18:28.935448Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:18:28.963138Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:28.984424Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:28.984459Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:29.003858Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:29.003898Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:29.015230Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:18:29.060395Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:29.084458Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:29.110570Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:29.110596Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:29.141002Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:29.208678Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:29.241220Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:29.241244Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:29.278945Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:29.313265Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:29.370435Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:29.402222Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:29.402247Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:29.407535Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:29.407560Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:29.448863Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:29.486018Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:29.561635Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:29.561683Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:29.602039Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:29.618559Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:29.678839Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:29.735246Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:29.735284Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:29.770329Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:29.833193Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:29.833261Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:29.865281Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:29.896548Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:29.958672Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:29.958709Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:30.055501Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:30.187466Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:30.192224Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:30.229732Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:30.229764Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:30.267431Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:30.267476Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:30.268658Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:30.372731Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:30.433275Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:30.433311Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:30.464284Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:30.515615Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:30.563100Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:18:30.569330Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:30.569361Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:30.625499Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:30.625537Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:30.651110Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:18:30.725976Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:31.140023Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:31.201376Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:31.201413Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:31.246958Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:31.845337Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:31.845377Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:31.919017Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:32.102756Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:32.217474Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:32.217517Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:32.260087Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:32.378834Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:32.378870Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:32.456054Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:32.524124Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:32.547966Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:32.547987Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:32.571274Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:33.049946Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:33.158093Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:33.158141Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:33.200248Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:33.464961Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:33.492752Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:33.492783Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:33.516858Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:34.496101Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:34.570151Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:34.570177Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:34.712756Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:34.737015Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18448 success=true
2026-09-12T18:18:34.771642Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=33 success=true
2026-09-12T18:18:34.774560Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:18:34.780266Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:35.009970Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:35.028719Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:18:35.028739Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.038340Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:18:35.105669Z  INFO local_candidate{attempt=46}: exchange table and repeat patch storage exchange_table_bytes=28100 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:18:35.329729Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:35.359388Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:35.359424Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.384178Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:35.392566Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=19092 success=true
2026-09-12T18:18:35.393308Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=13852 success=true
2026-09-12T18:18:35.393531Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=19003 success=true
2026-09-12T18:18:35.394363Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=19086 success=true
2026-09-12T18:18:35.394663Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=27793 success=true
2026-09-12T18:18:35.394766Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=12904 success=true
2026-09-12T18:18:35.426021Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=32 success=true
2026-09-12T18:18:35.429066Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:18:35.430360Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=35 success=true
2026-09-12T18:18:35.434710Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-12T18:18:35.438954Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:35.443265Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:18:35.549936Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=28262 success=true
2026-09-12T18:18:35.553827Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:35.563151Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:35.563393Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:35.563508Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:35.563873Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:35.563899Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:35.563909Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.565287Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:35.567907Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:35.568556Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:35.568575Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.570128Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:35.570586Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:35.572344Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:35.573106Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:35.575928Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:35.576320Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:35.576331Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.576820Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:35.577753Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:35.577846Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:35.577863Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:35.577875Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.580812Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:18:35.587228Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:35.587557Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:35.587564Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.588459Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:35.596557Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:35.597199Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:18:35.597228Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.597511Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:35.598186Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:35.598197Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.598863Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:18:35.600880Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:35.605993Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:35.610136Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:35.625404Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:35.625576Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:35.625869Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:35.625881Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.627926Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:35.629632Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:35.629648Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.636372Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:35.637546Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:35.645101Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:35.648536Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:35.649038Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:35.649053Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.650747Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:35.690137Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:35.691356Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:35.691376Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.693604Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:35.780780Z  INFO local_candidate{attempt=40}: exchange table and repeat patch storage exchange_table_bytes=27472 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:18:35.794863Z  INFO local_candidate{attempt=38}: exchange table and repeat patch storage exchange_table_bytes=27472 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:18:35.940932Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:35.950771Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:35.950800Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:35.970253Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:36.012186Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:36.041976Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:36.045052Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:36.045074Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.045174Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:36.045198Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.049304Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:36.087312Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:36.125847Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:36.149616Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:36.149638Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.181978Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:36.198267Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:36.222132Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:36.222155Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.253586Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:36.319912Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:36.325006Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:36.325024Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.331129Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:36.349431Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:36.349469Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:36.379566Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:18:36.398980Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:36.413540Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:36.413562Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.423925Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:36.466782Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:36.468658Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:36.468682Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.471965Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:36.535871Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:18:36.535907Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:36.543843Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:36.543855Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:18:36.546163Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:36.546179Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.548993Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:36.636795Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:36.649767Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:36.649788Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.656223Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:36.666556Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:36.675746Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:36.676371Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:36.676383Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.678466Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:36.693234Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:36.693870Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:36.693886Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.695622Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:36.701708Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:36.701739Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.704378Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:36.710902Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:36.714792Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:36.729313Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:36.729994Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:36.730004Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.732068Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:36.737024Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:36.737043Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.738987Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:36.743822Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:36.744258Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:36.744267Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.745561Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:36.752305Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:36.893907Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:36.899472Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:36.899491Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.906624Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:36.916262Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:36.932228Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:36.932828Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:36.932845Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.934253Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:36.940221Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:36.941198Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:36.960552Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:18:36.960580Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:36.972518Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:18:36.996390Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:37.024556Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:37.024580Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:37.050897Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:37.062893Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:37.064908Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:37.064928Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:37.079024Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:37.112535Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:37.113424Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:37.113437Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:37.116531Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:37.152056Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:37.152097Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:37.167771Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:18:37.265573Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=253 success=true
2026-09-12T18:18:37.265614Z  INFO local_candidate{attempt=46}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10008 exchange_table_bytes=28100 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:18:37.265627Z  INFO local_candidate{attempt=46}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28100 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10008 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:37.344962Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:37.382446Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:37.382469Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:37.428690Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:37.448572Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:37.485774Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:37.485798Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:37.530953Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:37.562674Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:37.562708Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:37.594493Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:37.831784Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=231 success=true
2026-09-12T18:18:37.831828Z  INFO local_candidate{attempt=40}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10068 exchange_table_bytes=27472 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:18:37.831851Z  INFO local_candidate{attempt=40}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27472 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10068 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:37.831847Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=182 success=true
2026-09-12T18:18:37.831879Z  INFO local_candidate{attempt=38}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10068 exchange_table_bytes=27472 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:18:37.831894Z  INFO local_candidate{attempt=38}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27472 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10068 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:18:37.940741Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:37.976878Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:37.976909Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:37.999811Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=734 success=true
2026-09-12T18:18:38.003637Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:38.005477Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:38.014997Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:38.015436Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:38.015927Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:38.015937Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.016396Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:38.016902Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:38.016913Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.017746Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:38.018069Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:38.023704Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:38.028577Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:38.029014Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:38.029023Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.030743Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:38.036576Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:38.037111Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:38.037120Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.038130Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:38.038844Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:38.041219Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:38.041607Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:38.041618Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.042682Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:38.047519Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:38.051964Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:38.053233Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:38.053778Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:38.063599Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:38.067661Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:38.091558Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:38.091582Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.119393Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:38.123926Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:38.123944Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.129935Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:38.143937Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:38.144648Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:38.144669Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.146525Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:38.169770Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:38.177278Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:38.178036Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:38.178048Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.179400Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:38.251594Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:38.310181Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:38.316223Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:38.316245Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.318934Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:38.318961Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.322796Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:38.331314Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:38.341166Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:38.341566Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:38.341576Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.342389Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:38.346548Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:38.431008Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:38.491555Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:38.492048Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:38.492059Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.493148Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:38.498020Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:38.501889Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:38.513388Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:38.513851Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:38.513862Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.515523Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:38.536192Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:38.546818Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:38.547075Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:38.547458Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:38.547469Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.548705Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:38.549164Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:38.549177Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.551995Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:18:38.579396Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:38.582065Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:38.582095Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.585906Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:38.644532Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:38.682725Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:38.682766Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.689617Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:38.711676Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:38.716241Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:38.716264Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.718984Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=887 success=true
2026-09-12T18:18:38.747020Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:38.756902Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:38.770496Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:38.770523Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.781214Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:38.815305Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:38.816310Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:38.816324Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.818101Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:38.883263Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:38.888721Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:38.888747Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.894454Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:18:38.930551Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:38.943762Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:38.954602Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:18:38.954638Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.958427Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:38.958456Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:38.965844Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:38.970002Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:18:38.983583Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:38.997320Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:38.997404Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:38.998722Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:38.999738Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:38.999784Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.001678Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:39.010043Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:39.012423Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:18:39.012438Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.015934Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:18:39.022087Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:18:39.024393Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:39.038614Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:39.046020Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:39.046037Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.052232Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:39.052261Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.056856Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:39.073451Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:39.083712Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:39.149259Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:39.157898Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:18:39.157929Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:39.167173Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:18:39.190769Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:39.191337Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:39.191347Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.192838Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:39.228259Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:39.239341Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:39.298183Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:39.298239Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.335178Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:39.359822Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:39.359854Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.370108Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:39.375889Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:18:39.447292Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:39.448885Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:39.448904Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.451365Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:39.484923Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:39.497950Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:39.497973Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.508135Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:39.527179Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:39.533548Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:39.534629Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:39.534642Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.535640Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:39.536396Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:39.547603Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:39.547622Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.558116Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:39.558136Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.565268Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:39.593846Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:39.624002Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:39.624952Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:39.625912Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:39.625926Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.628269Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:18:39.675257Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:39.675294Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.699184Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:39.719002Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:39.744852Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:39.744877Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.754863Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:39.762758Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:39.762782Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.773486Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:39.777091Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:39.792549Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:39.793454Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:39.801261Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:39.813858Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:39.814320Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:39.814331Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.815851Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:39.818479Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:39.818498Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.826176Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:39.826837Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:39.826850Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.828481Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:39.836590Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:39.843793Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:39.845658Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:39.846504Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:39.853653Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:39.857452Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:39.873924Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:39.874449Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:39.874462Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.875577Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:39.881064Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:39.894900Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:39.895442Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:39.895454Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.897550Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:39.904936Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:18:39.911681Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:39.911706Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:39.921897Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:39.924125Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:18:39.926291Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:39.926303Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.933284Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:39.945366Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:39.945740Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:39.945749Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.946789Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:39.961174Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:39.961213Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:39.971706Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:39.972044Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:39.972807Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:39.972819Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:39.974563Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:39.987737Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:18:39.997702Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:39.997729Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.037822Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:40.180967Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:40.184738Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:40.190171Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:40.190192Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.197693Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:40.212039Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:40.221675Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:40.221702Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.223252Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:40.223651Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:40.223661Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.224592Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:40.228949Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:40.249160Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:40.265405Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:40.267481Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:40.267497Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.269906Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:40.281371Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:40.281789Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:40.281804Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.282935Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:40.287932Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:40.292056Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:40.305728Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:40.306251Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:40.306262Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.308680Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:40.370785Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:18:40.398664Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:40.403932Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:40.403960Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.405281Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:40.405301Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.409687Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:40.435098Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:18:40.484797Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:40.509506Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:40.509531Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.528294Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:40.603379Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:40.616435Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:40.617230Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:40.617244Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.619178Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:40.695158Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:40.697140Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:40.698914Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:40.712008Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:40.714774Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:40.714808Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.716079Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:40.725468Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:40.730938Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:40.730964Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.736294Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:40.745587Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:40.745612Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.761325Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:40.764079Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:40.764099Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.770822Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:40.770850Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.779814Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:40.794628Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:40.802240Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:40.802269Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.810830Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:40.811846Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:40.811860Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.814596Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:18:40.830250Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:40.830948Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:18:40.830959Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:40.832435Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:18:40.838711Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:40.875906Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:40.885601Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:40.905040Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:40.905076Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:40.929178Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:18:40.930183Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:40.930240Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:40.972359Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:41.014748Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:41.014950Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:41.016283Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:41.016297Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:41.018853Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:41.050478Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:18:41.059935Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:18:41.059956Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:41.069961Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:18:41.077067Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:41.079464Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:41.079483Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:41.082011Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:41.116546Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:41.117452Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:41.117465Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:41.119042Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:41.158922Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:41.195540Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:41.200282Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:41.200309Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:41.205305Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:41.205325Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:41.225685Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:41.236690Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:41.277498Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:41.279733Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:41.279763Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:41.283296Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:41.539959Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:41.576512Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:41.576538Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:41.619996Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:41.848470Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:41.853742Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:41.881446Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:41.881472Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:41.926648Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:41.939102Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:41.939199Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:41.989048Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:42.025416Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:42.025475Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:42.039218Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:42.064049Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:42.113817Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:42.113866Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:42.129030Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:18:42.305289Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:42.341798Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:42.341826Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:42.387470Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:42.391950Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:42.435664Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:42.442725Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:42.442760Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:42.471700Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:42.471743Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:42.516623Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:42.530545Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:18:42.543647Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:42.543683Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:42.574623Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:42.786902Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:42.855291Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:42.855328Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:42.858746Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:42.880716Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:18:42.880742Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:42.895936Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:18:42.926000Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:42.995877Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:43.063320Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:43.063350Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:43.113682Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:43.149190Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:43.189517Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:43.191812Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:43.191837Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:43.224229Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:43.229622Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:43.229656Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:43.270836Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:43.277871Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:18:43.277901Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:43.426178Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:18:43.452662Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:43.483444Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:43.510987Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:43.511023Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:43.516799Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:43.516821Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:43.545786Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:43.545810Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:43.586935Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:43.594602Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:43.605680Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:43.621384Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:43.746039Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:43.746072Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:43.790961Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:44.107767Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:18:44.150197Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:18:44.162471Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:44.162537Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:44.193710Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:18:44.221961Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:44.232330Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:18:44.232356Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:44.277835Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:44.277855Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:44.360983Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:18:44.361730Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:44.940971Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:44.941012Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:45.017899Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:45.040275Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=9490 success=true
2026-09-12T18:18:46.263720Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:46.392830Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:46.392869Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:46.437122Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:46.456168Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=8456 success=true
2026-09-12T18:18:46.601818Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=8769 success=true
2026-09-12T18:18:46.616458Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:18:46.624271Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:18:46.624574Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:18:46.625049Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:46.625057Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.626415Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:18:46.632259Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:18:46.632697Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:46.632709Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.633870Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:18:46.635620Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:18:46.636535Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:18:46.636650Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:18:46.636914Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:46.636924Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.637079Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:18:46.637089Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.637838Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:18:46.638517Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:18:46.639107Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:18:46.639414Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:18:46.648428Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:18:46.648803Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:18:46.648812Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.649813Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:18:46.655119Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:18:46.659804Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:18:46.661084Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:18:46.661674Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:18:46.663460Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:18:46.665221Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:18:46.665241Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.668612Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:18:46.671501Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:18:46.672322Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:18:46.674018Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:18:46.674031Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.674751Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:18:46.676336Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:18:46.703292Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:18:46.704950Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:18:46.704974Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.708905Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=151 row_words=16 horizon=3578
2026-09-12T18:18:46.740494Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:18:46.741335Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:18:46.741694Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:18:46.741705Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.743069Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:18:46.744903Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:18:46.744919Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.749163Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:18:46.751500Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:18:46.763240Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:18:46.763620Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:18:46.763629Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.764658Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:18:46.776024Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:18:46.777257Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:18:46.777276Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1088 selected_horizon=1088 endpoint_lower_bound=288 lower_bound_gap=800 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.781003Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=677 row_words=17 horizon=1088
2026-09-12T18:18:46.786311Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:18:46.787215Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:18:46.787233Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.788935Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:18:46.789561Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:18:46.789572Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.789838Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:18:46.791094Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:18:46.805170Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:18:46.806042Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=2193 maximum_identical_destinations=1
2026-09-12T18:18:46.806056Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=3113 selected_horizon=3113 endpoint_lower_bound=2304 lower_bound_gap=809 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.808313Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=54 row_words=25 horizon=3113
2026-09-12T18:18:46.824260Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11430 success=true
2026-09-12T18:18:46.835365Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:18:46.835390Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:46.835716Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:18:46.847225Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:18:46.847267Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:18:46.847288Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.848661Z  INFO local_candidate{attempt=42}: costed final placed program final_cycles=11828137 final_exchange=4928725
2026-09-12T18:18:46.856640Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:18:46.877312Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:18:46.878070Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:18:46.878681Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:46.878698Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.880552Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:18:46.881736Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:18:46.883952Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:18:46.897443Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:18:46.905236Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:18:46.907833Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:18:46.907921Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:46.910910Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:18:47.065959Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:47.091034Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:47.091072Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:47.115250Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:47.138802Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11744 success=true
2026-09-12T18:18:47.160733Z  INFO local_candidate{attempt=41}: costed final placed program final_cycles=11833080 final_exchange=4933749
2026-09-12T18:18:47.278918Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:18:47.285771Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:18:47.312799Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:18:47.312827Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:47.314121Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:18:47.314157Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:47.339499Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:18:47.343189Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:18:47.398852Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:18:47.398889Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:47.429241Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:18:47.491377Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:18:47.496973Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:18:47.496997Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:47.502793Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:18:47.518235Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:18:47.531305Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:18:47.531330Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:47.537837Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:18:47.543875Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:18:47.569128Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:18:47.569152Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:47.597923Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:18:47.715946Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:18:47.729757Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:18:47.729780Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:47.731098Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:18:47.732035Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:18:47.732047Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:47.733665Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:18:47.740403Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:18:47.770663Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:18:47.771782Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:18:47.771796Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:47.773827Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:18:47.805338Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:18:47.810269Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:18:47.810299Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:47.815300Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:18:48.050008Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:18:48.053124Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:18:48.080940Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:48.080980Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:48.083823Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:18:48.083854Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:48.095437Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:18:48.105515Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:18:48.114653Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:18:48.115419Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:18:48.115439Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:48.125187Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:18:48.224864Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:18:48.233173Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=230 success=true
2026-09-12T18:18:48.261199Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:18:48.261246Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:48.307140Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=73 success=true
2026-09-12T18:18:48.311502Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:18:48.468221Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:18:48.487123Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:48.508618Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:18:48.508656Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:48.520762Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:18:48.577482Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:18:48.577518Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:48.582955Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:18:48.595266Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=265 success=true
2026-09-12T18:18:48.607662Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:48.607693Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:48.617888Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:18:48.654181Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:48.670026Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=74 success=true
2026-09-12T18:18:48.831768Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:18:48.839643Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:18:48.839666Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:48.851191Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:18:48.960602Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:18:48.972091Z  INFO local_candidate{attempt=42}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=462 success=true
2026-09-12T18:18:48.986347Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:18:48.986373Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:49.015178Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:18:49.030872Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=10311 success=true
2026-09-12T18:18:49.065836Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:18:49.127104Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:18:49.127127Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:49.165642Z  INFO local_candidate{attempt=41}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=433 success=true
2026-09-12T18:18:49.175629Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:18:49.344654Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:18:49.353432Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:18:49.353462Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:49.404120Z  INFO local_candidate{attempt=42}: retained faster incumbent candidate_cycles=11828137 cycles=11828137
2026-09-12T18:18:49.409494Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:18:49.415897Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:18:49.415922Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:49.515568Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:18:49.777689Z  INFO local_candidate{attempt=41}: retained faster incumbent candidate_cycles=11833080 cycles=11828137
2026-09-12T18:18:49.852678Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=14460 success=true
2026-09-12T18:18:49.888243Z  INFO local_candidate{attempt=45}: costed final placed program final_cycles=11828137 final_exchange=4928725
2026-09-12T18:18:50.223642Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:18:50.290647Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:18:50.290672Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4477 selected_horizon=4477 endpoint_lower_bound=1440 lower_bound_gap=3037 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:50.300659Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:18:50.300691Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:50.385777Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:18:50.400076Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=623 horizon=4477
2026-09-12T18:18:50.543723Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:18:50.566872Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:18:50.566893Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:50.577262Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:18:50.663658Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=15270 success=true
2026-09-12T18:18:50.699529Z  INFO local_candidate{attempt=47}: costed final placed program final_cycles=11824798 final_exchange=4924747
2026-09-12T18:18:51.108492Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5676 paired_horizon=11275 use_paired=false
2026-09-12T18:18:51.176080Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:18:51.176113Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5676 selected_horizon=5676 endpoint_lower_bound=4656 lower_bound_gap=1020 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:51.206646Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=109 row_words=344 horizon=5676
2026-09-12T18:18:51.240803Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=185 success=true
2026-09-12T18:18:51.336705Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=95 success=true
2026-09-12T18:18:51.469952Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:18:51.525974Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:18:51.526033Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:51.596415Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:18:51.823568Z  INFO local_candidate{attempt=45}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=421 success=true
2026-09-12T18:18:52.012186Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=179 success=true
2026-09-12T18:18:52.110295Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=98 success=true
2026-09-12T18:18:52.267687Z  INFO local_candidate{attempt=45}: retained faster incumbent candidate_cycles=11828137 cycles=11828137
2026-09-12T18:18:52.429593Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:18:52.477263Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:18:52.477286Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:52.513363Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:18:52.565371Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=397 success=true
2026-09-12T18:18:53.096873Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=17702 success=true
2026-09-12T18:18:53.129870Z  INFO local_candidate{attempt=48}: costed final placed program final_cycles=11826556 final_exchange=4928602
2026-09-12T18:18:54.204911Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=19467 success=true
2026-09-12T18:18:54.246192Z  INFO local_candidate{attempt=39}: costed final placed program final_cycles=12058987 final_exchange=4943521
2026-09-12T18:18:54.400058Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=100 success=true
2026-09-12T18:18:54.504487Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=104 success=true
2026-09-12T18:18:54.991350Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=434 success=true
2026-09-12T18:18:55.479280Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=106 success=true
2026-09-12T18:18:55.579802Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=100 success=true
2026-09-12T18:18:56.074228Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11033 success=true
2026-09-12T18:18:56.084457Z  INFO local_candidate{attempt=39}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=448 success=true
2026-09-12T18:18:56.104908Z  INFO local_candidate{attempt=44}: costed final placed program final_cycles=11828137 final_exchange=4928725
2026-09-12T18:18:56.368583Z  INFO local_candidate{attempt=39}: retained faster incumbent candidate_cycles=12058987 cycles=11828137
2026-09-12T18:18:57.304782Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10848 success=true
2026-09-12T18:18:57.327590Z  INFO local_candidate{attempt=46}: costed final placed program final_cycles=11824809 final_exchange=4924747
2026-09-12T18:18:57.421753Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=99 success=true
2026-09-12T18:18:57.516792Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=94 success=true
2026-09-12T18:18:57.648035Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:18:57.786856Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:18:57.786892Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:18:57.839618Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:18:58.002957Z  INFO local_candidate{attempt=44}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=425 success=true
2026-09-12T18:18:58.322954Z  INFO local_candidate{attempt=44}: retained faster incumbent candidate_cycles=11828137 cycles=11828137
2026-09-12T18:18:58.575148Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=108 success=true
2026-09-12T18:18:58.688337Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=113 success=true
2026-09-12T18:18:59.231829Z  INFO local_candidate{attempt=46}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=471 success=true
2026-09-12T18:18:59.405900Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:18:59.433619Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:18:59.433671Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:18:59.458505Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:18:59.658617Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10627 success=true
2026-09-12T18:18:59.686959Z  INFO local_candidate{attempt=40}: costed final placed program final_cycles=12058987 final_exchange=4943521
2026-09-12T18:19:01.079810Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=97 success=true
2026-09-12T18:19:01.130773Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:01.184714Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=104 success=true
2026-09-12T18:19:01.256069Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:19:01.256097Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:01.389007Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:19:01.427407Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=14825 success=true
2026-09-12T18:19:01.683503Z  INFO local_candidate{attempt=40}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=430 success=true
2026-09-12T18:19:02.145598Z  INFO local_candidate{attempt=40}: retained faster incumbent candidate_cycles=12058987 cycles=11828137
2026-09-12T18:19:04.724622Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=29329 success=true
2026-09-12T18:19:04.762450Z  INFO local_candidate{attempt=43}: costed final placed program final_cycles=11828137 final_exchange=4928725
2026-09-12T18:19:06.069573Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=91 success=true
2026-09-12T18:19:06.172147Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=102 success=true
2026-09-12T18:19:06.619877Z  INFO local_candidate{attempt=43}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=398 success=true
2026-09-12T18:19:06.844381Z  INFO local_candidate{attempt=43}: retained faster incumbent candidate_cycles=11828137 cycles=11828137
2026-09-12T18:19:11.923432Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10495 success=true
2026-09-12T18:19:11.955942Z  INFO local_candidate{attempt=38}: costed final placed program final_cycles=12058987 final_exchange=4943521
2026-09-12T18:19:13.090911Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=79 success=true
2026-09-12T18:19:13.177945Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=86 success=true
2026-09-12T18:19:13.603985Z  INFO local_candidate{attempt=38}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=379 success=true
2026-09-12T18:19:13.849528Z  INFO local_candidate{attempt=38}: retained faster incumbent candidate_cycles=12058987 cycles=11828137
2026-09-12T18:19:14.423337Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=46 before=11828137 after=11824809 changed_operations=[2] opened_boundaries=[]
2026-09-12T18:19:15.187745Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: saved mid-plan search state path=artifacts/search-state-20260912/bs1/state.json attempts=47 bytes=21381117
2026-09-12T18:19:16.783541Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-47-candidate-0-480354-0067.json scope="local-47-candidate-0" peak_step=63 effective_peak_bytes=472824
2026-09-12T18:19:16.831541Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-47-candidate-1-480354-0068.json scope="local-47-candidate-1" peak_step=63 effective_peak_bytes=472824
2026-09-12T18:19:16.888065Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-47-candidate-2-480354-0069.json scope="local-47-candidate-2" peak_step=63 effective_peak_bytes=472824
2026-09-12T18:19:16.942307Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-47-candidate-3-480354-0070.json scope="local-47-candidate-3" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:19:16.999448Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-47-candidate-4-480354-0071.json scope="local-47-candidate-4" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:19:17.061440Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-47-candidate-5-480354-0072.json scope="local-47-candidate-5" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:19:17.112462Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-47-candidate-6-480354-0073.json scope="local-47-candidate-6" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:19:17.161299Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-47-candidate-7-480354-0074.json scope="local-47-candidate-7" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:19:17.161659Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=8 threads=24
2026-09-12T18:19:23.954432Z  INFO local_candidate{attempt=51}: screened exchange table geometry expansion_ms=5600 expansion_and_footprint_ms=6792 estimated_row_bytes=37640 heuristic_row_bytes=104668 geometry_fragments_per_tile=4317 fragment_limit=16384
2026-09-12T18:19:24.073352Z  INFO local_candidate{attempt=51}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:19:24.280545Z  INFO local_candidate{attempt=50}: screened exchange table geometry expansion_ms=5882 expansion_and_footprint_ms=7118 estimated_row_bytes=37640 heuristic_row_bytes=104668 geometry_fragments_per_tile=4317 fragment_limit=16384
2026-09-12T18:19:24.401399Z  INFO local_candidate{attempt=50}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:19:24.424645Z  INFO local_candidate{attempt=54}: screened exchange table geometry expansion_ms=6017 expansion_and_footprint_ms=7262 estimated_row_bytes=37752 heuristic_row_bytes=105028 geometry_fragments_per_tile=4329 fragment_limit=16384
2026-09-12T18:19:24.454135Z  INFO local_candidate{attempt=47}: screened exchange table geometry expansion_ms=6117 expansion_and_footprint_ms=7292 estimated_row_bytes=37480 heuristic_row_bytes=102364 geometry_fragments_per_tile=4295 fragment_limit=16384
2026-09-12T18:19:24.459537Z  INFO local_candidate{attempt=48}: screened exchange table geometry expansion_ms=6185 expansion_and_footprint_ms=7297 estimated_row_bytes=37480 heuristic_row_bytes=102364 geometry_fragments_per_tile=4295 fragment_limit=16384
2026-09-12T18:19:24.538781Z  INFO local_candidate{attempt=54}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:19:24.573410Z  INFO local_candidate{attempt=47}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:19:24.577503Z  INFO local_candidate{attempt=48}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:19:24.589730Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:24.599583Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:24.599601Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:24.600044Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:24.600053Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.600933Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:24.606417Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:24.607168Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:24.608292Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:24.608312Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.611229Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:24.611730Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:24.612107Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:24.612114Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.612506Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:24.613560Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:24.618595Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:24.619084Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:24.619091Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.620658Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:24.622864Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:24.623053Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:24.623234Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:24.623243Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.624090Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:24.624838Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:24.624854Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.627970Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:24.629171Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:24.633686Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:24.634916Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:24.635563Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:24.637939Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:24.644622Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:24.649225Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:24.659550Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:24.681581Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:24.682803Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:24.685906Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:24.685928Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.690441Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:24.696024Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:24.696760Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:24.696780Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.699408Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:24.704810Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:24.710092Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:24.710118Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.717512Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:24.723569Z  INFO local_candidate{attempt=49}: screened exchange table geometry expansion_ms=6401 expansion_and_footprint_ms=7561 estimated_row_bytes=37480 heuristic_row_bytes=102364 geometry_fragments_per_tile=4295 fragment_limit=16384
2026-09-12T18:19:24.729299Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:24.729662Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:24.729669Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.730652Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:24.747654Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:19:24.747685Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:24.755602Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:19:24.757652Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:24.758392Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:24.758404Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.759739Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:24.766236Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:24.771431Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:24.771451Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.777556Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:24.836562Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:24.842848Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:24.842868Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:24.854018Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:24.870889Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:24.870932Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:24.881785Z  INFO local_candidate{attempt=49}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:19:24.883774Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:19:25.035281Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:25.036224Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:25.036241Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.038538Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:25.085327Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:25.087305Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:25.087319Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.089452Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:25.091048Z  INFO local_candidate{attempt=53}: screened exchange table geometry expansion_ms=6663 expansion_and_footprint_ms=7929 estimated_row_bytes=37640 heuristic_row_bytes=104668 geometry_fragments_per_tile=4317 fragment_limit=16384
2026-09-12T18:19:25.136443Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:25.136862Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:25.136870Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.138070Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:25.145627Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:25.162371Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:25.162398Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.194825Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:25.214616Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:25.215018Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:25.215027Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.215856Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:25.219422Z  INFO local_candidate{attempt=53}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:19:25.220092Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:25.289526Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:25.290559Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:25.290579Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.292916Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:25.299861Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:25.300442Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:25.306310Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:25.306332Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.313353Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:25.322909Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:25.335131Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:25.335162Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.363427Z  INFO local_candidate{attempt=52}: screened exchange table geometry expansion_ms=6869 expansion_and_footprint_ms=8201 estimated_row_bytes=37640 heuristic_row_bytes=104668 geometry_fragments_per_tile=4317 fragment_limit=16384
2026-09-12T18:19:25.377321Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:25.399152Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:25.399194Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:25.400141Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:25.411700Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:25.411723Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.417181Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:25.434778Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:25.435434Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:25.435445Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.437257Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:25.439949Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:19:25.447547Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:25.447956Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:25.447964Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.448929Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:25.453816Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:25.458153Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:25.488704Z  INFO local_candidate{attempt=52}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:19:25.564480Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:25.590258Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:25.590285Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.616739Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:25.618179Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:25.650853Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:25.650885Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.689484Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:25.713584Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:25.714135Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:25.714142Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.715557Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:25.721564Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:25.724047Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:25.724541Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:25.724549Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.725701Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:25.731080Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:25.731095Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.734462Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:25.734966Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:25.734974Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.736264Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:25.754365Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:25.772588Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:25.776106Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:25.776904Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:25.791787Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:25.796926Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:25.796948Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.801815Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:25.821322Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:19:25.821345Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:25.829728Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:25.832190Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:19:25.959924Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:25.981899Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:25.981923Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.002318Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:26.151034Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:26.159788Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:26.160574Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:26.173018Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:26.173513Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:26.173524Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.175338Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:26.185133Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:26.185153Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.185578Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:26.185979Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:26.185986Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.187081Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:26.192526Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:26.197691Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:26.199185Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:26.199922Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:26.200287Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:26.210160Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:26.217648Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:26.225768Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:26.226294Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:26.226306Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.227642Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:26.229266Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:26.229287Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.278905Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:26.281225Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:26.287746Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:26.293921Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:26.293944Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.301885Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:26.315742Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:26.316213Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:26.316236Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.317522Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:26.344620Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:26.345460Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:26.345473Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.347312Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:26.350288Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:26.357293Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:26.369239Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:26.369661Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:26.369668Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.371336Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:26.381226Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:26.381621Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:26.381628Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.382675Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:26.388003Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:26.390034Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:26.393075Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:26.394545Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:26.395258Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:26.405125Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:26.411781Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:26.418666Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:26.418698Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.427282Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:26.428602Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:26.428637Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.434967Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:26.444175Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:26.451968Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:26.451995Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.457662Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:26.457699Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.458534Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:26.462786Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:26.471501Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:26.472552Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:26.472569Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.474453Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:26.482217Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:26.488552Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:26.491017Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:26.492222Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:26.492234Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.492797Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:26.492810Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.494516Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:26.498872Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:26.500071Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:26.512591Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:26.512610Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.513490Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:26.513978Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:26.513985Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.515271Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:26.523187Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:26.541862Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:26.542688Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:26.542700Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.544295Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:26.551282Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:26.552408Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:26.552421Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.554653Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:26.627172Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:26.631362Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:26.632000Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:26.632017Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.637229Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:26.638316Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:26.638343Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.647953Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:26.726658Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:26.733597Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:26.735542Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:26.735559Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.742634Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:26.742653Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.747310Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:26.758608Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:26.763998Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:26.800700Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:26.808839Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:26.808869Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.810602Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:26.810621Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.816904Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:26.822413Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:26.830478Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:26.830498Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.841224Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:26.851584Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:26.868397Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:26.868929Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:26.868953Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:26.869501Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:26.869513Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.871270Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:26.873432Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:26.886317Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:26.894160Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:26.903384Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:19:26.909049Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:26.909133Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:26.909156Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.910003Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:26.910021Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.914434Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:26.925656Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:26.934560Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:26.935249Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:26.935266Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.937575Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:26.947784Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:26.956142Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:26.957747Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:26.958367Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:26.958975Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:26.958987Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:26.959303Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:26.961509Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:26.985432Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:26.989921Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:27.005709Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:27.005732Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.008606Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:27.009763Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:27.009781Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.017528Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:27.019301Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:27.021544Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:27.021562Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.028340Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:27.029818Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:27.045041Z  INFO local_candidate{attempt=54}: compared ordinary and paired exchange schedules phase=56 candidates=36 ordinary_horizon=232 paired_horizon=1392 use_paired=false
2026-09-12T18:19:27.051515Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:27.052399Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:27.052419Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.054603Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:27.063889Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:27.066525Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:27.066556Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.068312Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:27.069023Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:27.069065Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.070145Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:27.070771Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:27.078871Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:27.085852Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:27.092601Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:27.095772Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:27.096132Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:27.096142Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.097148Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:27.102248Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:27.107448Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:27.114972Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:27.114999Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.115078Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:27.115634Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:27.115646Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.115765Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:27.115780Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.116121Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:27.116145Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.117539Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:27.121284Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:27.123425Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:27.123440Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.125787Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:27.127090Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:27.130715Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:27.133832Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:27.135454Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:27.135468Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.142042Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:27.148425Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:27.156123Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:27.156672Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:27.156684Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.158283Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:27.184706Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:27.185184Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:27.186055Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:27.186071Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.186913Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:27.186929Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.187598Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:27.189865Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:27.215451Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:27.228688Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:27.228734Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.247910Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:27.339511Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:27.368903Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:27.381674Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:27.381696Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.389311Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:27.402546Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:27.402593Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.419567Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:27.420332Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:27.420349Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.422518Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:27.434495Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:27.434942Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:27.434950Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.436089Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:27.441659Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:27.446622Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:27.459923Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:27.496613Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:27.537038Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:27.555539Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:27.555563Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.561835Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:27.561861Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.568178Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:27.625469Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:27.627471Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:27.627486Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.629810Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:27.681886Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:27.684461Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:27.704377Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:27.704398Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.733063Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:27.796306Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:27.820085Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:27.820108Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.847941Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:27.850233Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:27.863384Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:27.863433Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:27.872118Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:27.873321Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:27.873341Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.890981Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:27.891005Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.898602Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:27.898623Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.899502Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:27.899530Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.906302Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:27.926121Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:27.932977Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:27.954914Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:27.964271Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:27.974473Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:27.976281Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:27.976300Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.978234Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:27.978261Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.979366Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:27.980662Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:27.982438Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:27.982451Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:27.985110Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:27.985591Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:27.987312Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:27.993002Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:27.997993Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:27.999706Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:27.999718Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.002632Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:28.005477Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:28.006253Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:28.006266Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.008167Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:28.010065Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:28.013518Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:28.020004Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:28.020469Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:28.020485Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.021534Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:28.026851Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:28.031433Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:28.038390Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:28.049726Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:28.057735Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:28.065557Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:28.067680Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:28.082357Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:28.085706Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:28.092585Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:28.098412Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:28.100070Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:28.100092Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.103822Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:28.103850Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:28.104793Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:28.105184Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:28.105192Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.107134Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:28.116947Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:28.117335Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:28.117345Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.118343Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:28.124487Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:28.131174Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:28.132880Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:28.133639Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:28.138934Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:28.138966Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.141118Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:19:28.148636Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:28.154796Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:28.171920Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:28.173013Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:28.183468Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:28.186371Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:28.186390Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.187047Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:28.187063Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.197703Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:28.206293Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:28.212289Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:28.212308Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.213789Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:28.219280Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:28.222060Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:28.225334Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:28.225817Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:28.225888Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:28.225902Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.226764Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:28.226776Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.226963Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:28.226974Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.228402Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:28.229049Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:28.230344Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:28.232967Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:28.239300Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:28.241352Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:28.241856Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:28.241868Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.242949Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:28.247615Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:28.247998Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:28.248006Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.248351Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:28.249077Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:28.257983Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:28.258893Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:28.259282Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:28.259291Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.260546Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:28.273465Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:28.274257Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:28.274274Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.275962Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:28.278595Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:28.278613Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.285346Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:28.294464Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:28.294913Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:28.303756Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:28.305679Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:28.320499Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:19:28.320533Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:28.320977Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:28.320992Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.327940Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:19:28.362894Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:28.366925Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:28.372953Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:28.405114Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:28.405148Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.405402Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:28.405432Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.411002Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:28.413312Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:28.413335Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.417052Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:28.424862Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:28.440848Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:28.442553Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:28.461379Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:28.469300Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:28.469319Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.471303Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:28.480468Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:28.481273Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:28.511171Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:28.519325Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:28.529293Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:28.529312Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.551665Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:28.592862Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:28.592899Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.663101Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:28.666519Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:28.666550Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:28.669653Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:28.669674Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.679420Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:28.688573Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:28.690761Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:28.696442Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:19:28.720628Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:28.720649Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.763292Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:28.779759Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:28.789863Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:28.789886Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.797094Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:28.797145Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:28.815778Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:28.851319Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:19:28.851355Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:28.862803Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:19:28.881331Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:19:28.943812Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:28.956671Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:28.956695Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.963445Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:28.982224Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:28.982774Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:28.982783Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.984711Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:28.995700Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:28.996092Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:28.996100Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:28.997090Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:29.002027Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:29.006181Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:29.007266Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:29.013984Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:29.025195Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:29.025564Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:29.025572Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.026970Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:29.035844Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:29.036179Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:29.036194Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.037102Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:29.041638Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:29.045681Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:29.046811Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:29.047361Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:29.057148Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:29.084665Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:29.127049Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:29.130998Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:29.131017Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.137626Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:29.149181Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:29.149563Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:29.149572Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.150471Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:29.173912Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:29.174621Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:29.174633Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.175963Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:29.181630Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:19:29.181655Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.356356Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:19:29.413819Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:29.432249Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:29.433110Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:29.433129Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.435648Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:29.469928Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:29.487092Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:29.488414Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:29.508374Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:29.508400Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.517469Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:29.517494Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.520534Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:29.520566Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.522228Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:29.536385Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:29.552365Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:29.565069Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:29.565092Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.568449Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:29.570517Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:29.570533Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.572934Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:29.585844Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:29.590176Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:29.591745Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:29.591759Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.595243Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:29.600714Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:29.602937Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:29.605863Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:29.626108Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:29.626942Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:29.626968Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.628725Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:29.629008Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:29.645813Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:29.647997Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:29.648474Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:29.648485Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.649895Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:29.659195Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:29.659881Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:29.660246Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:29.660256Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.661163Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:29.666175Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:29.669597Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:29.679444Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:29.679963Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:29.679971Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.681909Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:29.685337Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:29.687648Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:29.687663Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.690127Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:29.696708Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:29.696732Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.733496Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:29.733539Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.761403Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:29.767674Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:29.776571Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:29.776597Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.780641Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:29.794596Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:29.799050Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:29.800058Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:29.800072Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.802414Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:29.805551Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:29.837077Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:29.842430Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:29.842456Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.850738Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:29.850773Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.873238Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:29.882727Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:29.883550Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:29.883569Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.885071Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:29.885087Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.885531Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:29.893849Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:29.894804Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:29.901458Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:29.909997Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:29.916967Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:29.917995Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:29.918012Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.921235Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:29.921547Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:29.922395Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:29.922417Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.925552Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:29.937062Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:29.937857Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:29.937871Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.940073Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:29.941841Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:29.942454Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:29.942474Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.944029Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:29.946947Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:29.951832Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:29.952839Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:29.956635Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:29.968177Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:29.968660Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:29.968670Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.970263Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:29.981534Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:29.982269Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:29.982298Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.984280Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:29.990767Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:29.990801Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:29.992967Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:30.010920Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:30.011697Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:30.011710Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.013783Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:30.023130Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:30.025531Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:30.025549Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.028321Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:30.037046Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:30.057231Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:30.062689Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:30.063279Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:30.063289Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.064706Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:30.084799Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:30.101474Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:30.101501Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.104867Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:19:30.104889Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.117619Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:19:30.181532Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:30.211922Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:30.222326Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:30.234122Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:30.234145Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.236015Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:30.236428Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:30.236440Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.237806Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:30.247466Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:30.247816Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:30.247825Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.248721Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:30.253535Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:30.262111Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:30.266625Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:30.267158Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:30.267169Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.268681Z  INFO local_candidate{attempt=48}: compared ordinary and paired exchange schedules phase=22 candidates=18 ordinary_horizon=2545 paired_horizon=2330 use_paired=false
2026-09-12T18:19:30.269050Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:30.277620Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:30.277643Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:30.281186Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:30.294902Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:30.303155Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:30.303187Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.313756Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:30.327716Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:30.337726Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:30.337766Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:30.343978Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:30.344665Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:30.344706Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:30.346141Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:30.353268Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:30.364667Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:19:30.493140Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:19:30.493166Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:30.502884Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:19:31.011056Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:31.019120Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:31.019156Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:31.057358Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:19:31.058987Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:31.059024Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:31.097213Z  INFO local_candidate{attempt=49}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:19:31.106374Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:31.145011Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:19:31.145048Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:31.159162Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:19:31.179346Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:31.179929Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:31.179939Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:31.180941Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:31.186271Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:31.229063Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:31.302080Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:31.304715Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:31.304745Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:31.337033Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:31.337058Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:31.347901Z  INFO local_candidate{attempt=48}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:19:31.382186Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:31.383056Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:31.390426Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:19:31.390448Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:31.391668Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:31.391697Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:31.402180Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:31.402837Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:31.404499Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:19:31.418776Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:31.598894Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:31.604450Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:31.604473Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:31.611474Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:31.620859Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:31.631309Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:31.631702Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:31.631710Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:31.632526Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:31.637017Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:31.712800Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:31.759838Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:31.759864Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:31.806862Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:31.808098Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:31.861316Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:31.863698Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:31.863721Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:31.906936Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:31.906962Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:31.945640Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:31.946103Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:31.967501Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:31.986706Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:31.986744Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.030318Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:32.110412Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:32.141104Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:32.146757Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:32.146789Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.153790Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:32.153822Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:32.167766Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:19:32.173564Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:32.187920Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:32.187946Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.192795Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:32.198417Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:32.198437Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.205429Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:32.207642Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:32.214764Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:32.225008Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:32.225403Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:32.225426Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.226253Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:32.230654Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:32.236885Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:32.248796Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:32.248820Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.253114Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:32.256392Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:32.261460Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:32.261477Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.282059Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:32.292390Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:32.292416Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:32.292433Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.294230Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:32.306455Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:32.306863Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:32.306871Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.308337Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:32.321521Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:32.330881Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:32.330922Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.335735Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:32.338548Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:32.338611Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.342414Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:32.342869Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:32.343631Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:32.425619Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:32.444763Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:32.444787Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.455934Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:32.457407Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:32.470096Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:32.470126Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:32.482788Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:19:32.491452Z  INFO local_candidate{attempt=51}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:32.493299Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:32.493355Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.496784Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:32.501786Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:32.506903Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:32.506934Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.509974Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:32.510222Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:32.511031Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:32.511044Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.512803Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:32.521957Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:32.522348Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:32.522358Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.523865Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:32.533423Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:32.533760Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:32.533767Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.534723Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:32.539519Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:32.543748Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:32.544913Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:32.545471Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:32.555102Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:32.575269Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:32.583863Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:32.614722Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:32.617501Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:32.618587Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:32.618600Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.618609Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:32.618622Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.621713Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:32.624976Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:32.636691Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:32.637065Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:32.637086Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.638122Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:32.668101Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:32.669356Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:32.669416Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.671451Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:32.759723Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:32.760281Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:19:32.760313Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:32.812214Z  INFO local_candidate{attempt=51}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:19:32.853766Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:19:32.853808Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.922134Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:19:32.927933Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:32.933387Z  INFO local_candidate{attempt=51}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:32.933418Z  INFO local_candidate{attempt=51}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:32.947734Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:32.954303Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:32.954333Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.972218Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:32.972250Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.978750Z  INFO local_candidate{attempt=51}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:19:32.979400Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:32.980167Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:32.980178Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:32.982137Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:32.985072Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:32.998095Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:33.055479Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:19:33.056881Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:33.129964Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:33.132038Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:33.132059Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.137030Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:33.144370Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:33.149520Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:33.149538Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.154722Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:33.251883Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:33.267617Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:33.267640Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.278543Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:33.289470Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:33.309527Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:33.309550Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.310513Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:33.311695Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:33.311712Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.313864Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:33.337827Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:33.365914Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:33.366679Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:33.366692Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.368748Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:33.369863Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:33.382571Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:33.382590Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.389013Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:33.408361Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:33.408922Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:33.408930Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.410880Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:33.424644Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:33.425230Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:33.425245Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.426683Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:33.433426Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:33.438283Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:33.458381Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:33.482290Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:33.502120Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:33.502157Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.541157Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:33.547735Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:33.547771Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.548233Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:33.558073Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:33.558092Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.571170Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:33.576891Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:33.577851Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:33.577865Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.580121Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:33.640016Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:33.779994Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:33.800266Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:33.800293Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.814251Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:33.872547Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:33.874770Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:33.874786Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:33.877471Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:33.903052Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:33.903094Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:33.940425Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:19:33.940449Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:33.974832Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:33.974858Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:34.018722Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:34.184784Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:19:34.184822Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:34.350198Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:34.361709Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:34.361730Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:34.366866Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:19:34.380724Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:34.463818Z  INFO local_candidate{attempt=49}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:34.497448Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:34.520685Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:34.520709Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:34.552615Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:34.552665Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:34.554525Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:34.559582Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:34.580158Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:34.580187Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:34.586241Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:34.596698Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:34.604467Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:34.614981Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:34.615002Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:34.650486Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:34.657851Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:34.660150Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:34.660165Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:34.662928Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:34.688466Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:34.689928Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:34.689940Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:34.692850Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:34.704509Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:34.730529Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:34.754144Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:34.763443Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:34.763467Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:34.764462Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:34.792518Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:34.820529Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:34.828562Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:34.860725Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:34.860765Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:34.899637Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:34.905578Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:34.905615Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.006266Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:35.049798Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:35.077965Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:35.077993Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.102218Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:35.103265Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:35.115040Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:35.125520Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:35.125541Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.142646Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:35.147017Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:35.147039Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.189294Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:35.256481Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:35.261496Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:35.261519Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.266962Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:35.327323Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:35.327359Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:35.354309Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:19:35.390499Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:35.393589Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:35.393618Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:35.407496Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:19:35.414949Z  INFO local_candidate{attempt=54}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:19:35.417244Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:35.417265Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.459332Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:35.462669Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:35.492746Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:35.492783Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:35.493251Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:35.493271Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.507466Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:19:35.507500Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:35.515132Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:19:35.521480Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:19:35.533222Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:35.558262Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:35.558825Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:35.558831Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.559713Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:35.559746Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:35.560214Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:35.619256Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:35.620516Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:19:35.629449Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:35.629482Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:35.670388Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:19:35.670421Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:35.682044Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:19:35.687219Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:35.687253Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:35.709875Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:35.709907Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.719420Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:19:35.739107Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:19:35.770577Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:35.778706Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:35.791870Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:35.792335Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:35.792348Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.794149Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:35.805917Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:35.806576Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:35.806597Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.808264Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:35.811554Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:35.816823Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:35.823478Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:35.825705Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:35.826785Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:35.842556Z  INFO local_candidate{attempt=47}: compared ordinary and paired exchange schedules phase=22 candidates=18 ordinary_horizon=2545 paired_horizon=2362 use_paired=false
2026-09-12T18:19:35.843528Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:35.854034Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:35.854069Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:35.860703Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:35.874251Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:35.878712Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:35.879188Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:35.879198Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.880384Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:35.886270Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:35.900117Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:35.900768Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:35.900779Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.903031Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:35.921156Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:35.925518Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:35.925535Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.933389Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:35.934353Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:35.934381Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.945448Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:35.947255Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:35.947848Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:35.947859Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.948700Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:35.949493Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:35.976682Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:35.977363Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:35.977392Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:35.977396Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.977402Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:35.978885Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:36.018462Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:36.018506Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.021630Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:36.029939Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:36.044947Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:36.080284Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:36.081051Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:36.081063Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.082546Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:36.082569Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.083301Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:36.102303Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:36.120902Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:36.122980Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:36.131952Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:36.131971Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.132757Z  INFO local_candidate{attempt=48}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:36.149186Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:36.149692Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:36.149703Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.150773Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:36.156412Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:36.167746Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:36.170655Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:36.171413Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:36.171424Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.173478Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:36.189396Z  INFO local_candidate{attempt=48}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:19:36.189731Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:36.190214Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:36.190222Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.191505Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:36.203380Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:36.203428Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.249619Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:36.251916Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:36.251932Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.254404Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:36.257555Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:36.286199Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:36.291802Z  INFO local_candidate{attempt=49}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:19:36.332314Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:36.332338Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.347316Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:36.347349Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:36.396338Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:36.406985Z  INFO local_candidate{attempt=49}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:36.407014Z  INFO local_candidate{attempt=49}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:36.416999Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:19:36.435444Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:36.451371Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:36.452052Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:36.452069Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.454537Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:36.457742Z  INFO local_candidate{attempt=49}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:19:36.503645Z  INFO local_candidate{attempt=53}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:19:36.613538Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:36.618769Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:36.618792Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:36.633401Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:19:36.633425Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.646823Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:19:36.665102Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:19:36.696906Z  INFO local_candidate{attempt=47}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:19:36.737701Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:19:36.737736Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:36.748523Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:19:36.748543Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:36.752266Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:36.762909Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:36.762931Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.770734Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:36.778959Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:36.778979Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.794123Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:36.794840Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:36.794853Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.796982Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:36.805322Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:36.809002Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:36.809464Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:36.809475Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.810655Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:36.816335Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:36.821315Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:36.830688Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:36.831060Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:36.831066Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.831985Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:36.836336Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:36.836859Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:36.869236Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:36.869262Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.872854Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:36.875808Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:36.897928Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:36.897954Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.898379Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:36.900070Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:36.906514Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:36.906532Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.913524Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:36.922662Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:36.928064Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:36.932675Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:36.932696Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.950110Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:36.959476Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:36.959507Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:36.969124Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:36.982246Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:37.005847Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:37.005869Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.027256Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:37.035219Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:37.037664Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:37.066846Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:37.066867Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.107109Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:37.130889Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:37.131469Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:37.131480Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.132966Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:37.192955Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:37.195324Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:37.195341Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.198055Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:37.275314Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:37.279918Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:37.279958Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:37.287915Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:37.287934Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.303544Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:19:37.305131Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:37.371323Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:37.381182Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:37.406811Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:37.406836Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.425824Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:37.425862Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.427924Z  INFO local_candidate{attempt=48}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:37.427960Z  INFO local_candidate{attempt=48}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:37.446136Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:37.446926Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:19:37.446960Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:37.457143Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:19:37.491058Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:37.492339Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:37.492354Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.494832Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:37.503250Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:37.547179Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:37.554531Z  INFO local_candidate{attempt=48}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:19:37.562096Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:37.562564Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:37.562577Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.564165Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:37.595387Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:37.600006Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:37.615419Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:19:37.615439Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.625945Z  INFO local_candidate{attempt=50}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:19:37.631044Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:19:37.638341Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:37.638362Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.697987Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:37.736935Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:37.738224Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:37.738239Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.741033Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:37.751429Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:37.751456Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:37.769508Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:37.799531Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:19:37.809625Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:37.809648Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:37.863685Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:38.053518Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:38.098131Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:38.101389Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:38.101419Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.106243Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:38.106266Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.116987Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:38.125354Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:38.132629Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:38.136613Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:38.137695Z  INFO local_candidate{attempt=47}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:19:38.148919Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:38.149563Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:38.149578Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.150114Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:38.150130Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.150898Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:38.158315Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:38.178591Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:38.207622Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:38.208427Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:38.208439Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.211115Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:38.244669Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:38.254086Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:38.254115Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:38.287066Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:38.287090Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.300572Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:19:38.326998Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:38.347020Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:38.396352Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:38.396390Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:38.415143Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:38.415168Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.426526Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:19:38.469447Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:38.512709Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:38.512740Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:38.526352Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:19:38.550364Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:38.577823Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:19:38.577852Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:38.585306Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:19:38.590744Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:38.590773Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.624611Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:38.629646Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:38.654572Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:38.654595Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.673953Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:38.673986Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:38.682997Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:38.686319Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:19:38.707493Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:38.711811Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:38.712602Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:38.712615Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.715140Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:38.751577Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:38.751640Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.791398Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:38.933639Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:38.933677Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:38.955887Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:38.962760Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:38.965573Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:19:38.973823Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:38.973845Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:38.991537Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:38.991799Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:38.991816Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:39.001745Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:39.004002Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:39.004032Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:39.019836Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:19:39.037026Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:39.037061Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:39.042315Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:39.068653Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:39.101426Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:39.102418Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:39.102432Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:39.105628Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:39.224725Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:19:39.224764Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:39.367848Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:19:39.379522Z  INFO local_candidate{attempt=54}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:39.430655Z  INFO local_candidate{attempt=47}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:39.432044Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:39.432060Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:39.435016Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:39.442810Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:39.442831Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:39.479029Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:39.501444Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:39.545378Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:39.545410Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:39.651891Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:39.697118Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:39.697982Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:39.697997Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:39.700086Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:39.715454Z  INFO local_candidate{attempt=54}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:39.715488Z  INFO local_candidate{attempt=54}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:39.789093Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:39.802146Z  INFO local_candidate{attempt=54}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:19:39.882353Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:19:39.882398Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:39.909227Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:39.915170Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:39.937103Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:39.937126Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:39.948659Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:39.948686Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:39.956199Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:39.965491Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:39.970034Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:39.982218Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:39.985357Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:39.985377Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:40.008180Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:40.008218Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:40.021368Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:40.041661Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:40.043597Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:40.044073Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:40.044080Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:40.044451Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:40.045268Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:40.046783Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:40.046797Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:40.049196Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:40.049198Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:19:40.173749Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:40.253189Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:40.253230Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:40.292544Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:40.351921Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:40.365361Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:40.365395Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:40.435591Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:40.471233Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:40.502918Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:40.502946Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:40.590444Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:40.758273Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:40.758310Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:40.760571Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:40.760601Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:40.788996Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:19:40.792659Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:19:40.808375Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:40.847587Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:40.847627Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:40.885916Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:40.912744Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:40.932794Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:40.968528Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:40.968551Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:40.989453Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:40.989477Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:41.060085Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:41.066648Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:41.074683Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:41.074715Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:41.082856Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:41.104938Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:41.104958Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:41.143376Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:41.157545Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:19:41.337538Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:41.365474Z  INFO local_candidate{attempt=53}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:41.425774Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:19:41.425820Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:41.432068Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:41.432108Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:41.484304Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:41.501736Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:41.501770Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:41.532222Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:19:41.588857Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:19:41.793510Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:41.865154Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:41.865190Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:41.926292Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:42.098886Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:42.098923Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:42.174773Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:19:42.318348Z  INFO local_candidate{attempt=50}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:42.375530Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:42.375555Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:42.397116Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:42.404292Z  INFO local_candidate{attempt=53}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:42.404323Z  INFO local_candidate{attempt=53}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:42.419260Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:42.482405Z  INFO local_candidate{attempt=53}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:19:42.487171Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:19:42.487196Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:42.535257Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=25 success=true
2026-09-12T18:19:42.538234Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:19:42.543970Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:19:42.623876Z  INFO local_candidate{attempt=47}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:42.623908Z  INFO local_candidate{attempt=47}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:42.631387Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:19:42.635184Z  INFO local_candidate{attempt=47}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:19:42.639922Z  INFO local_candidate{attempt=52}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:19:42.700645Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:42.720068Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:19:42.720088Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:42.729135Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:19:42.749869Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:42.749891Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:42.760059Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=24 success=true
2026-09-12T18:19:42.761578Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=25 success=true
2026-09-12T18:19:42.763231Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:19:42.764479Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:19:42.769577Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:19:42.770144Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:19:42.789563Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:19:42.867993Z  INFO local_candidate{attempt=50}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:42.868031Z  INFO local_candidate{attempt=50}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:42.871852Z  INFO local_candidate{attempt=53}: exchange table and repeat patch storage exchange_table_bytes=28100 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:19:42.952802Z  INFO local_candidate{attempt=50}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:19:43.042156Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:43.069918Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:43.069960Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:43.089347Z  INFO local_candidate{attempt=54}: exchange table and repeat patch storage exchange_table_bytes=28132 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:19:43.093186Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:43.093266Z  INFO local_candidate{attempt=49}: exchange table and repeat patch storage exchange_table_bytes=27512 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:19:43.509688Z  INFO local_candidate{attempt=52}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:43.539484Z  INFO local_candidate{attempt=52}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:43.539505Z  INFO local_candidate{attempt=52}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:43.582767Z  INFO local_candidate{attempt=52}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:43.626591Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=25 success=true
2026-09-12T18:19:43.626676Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=26 success=true
2026-09-12T18:19:43.626726Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=26 success=true
2026-09-12T18:19:43.628544Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=28 success=true
2026-09-12T18:19:43.629772Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:19:43.629830Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:19:43.630979Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=30 success=true
2026-09-12T18:19:43.631122Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-12T18:19:43.631625Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:19:43.634072Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:19:43.635418Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:19:43.635981Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:19:43.637426Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:19:43.639857Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:19:43.640339Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:19:43.952139Z  INFO local_candidate{attempt=48}: exchange table and repeat patch storage exchange_table_bytes=27512 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:19:43.953022Z  INFO local_candidate{attempt=50}: exchange table and repeat patch storage exchange_table_bytes=28100 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:19:43.959128Z  INFO local_candidate{attempt=52}: exchange table and repeat patch storage exchange_table_bytes=28100 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:19:43.970317Z  INFO local_candidate{attempt=47}: exchange table and repeat patch storage exchange_table_bytes=27512 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:19:43.974638Z  INFO local_candidate{attempt=51}: exchange table and repeat patch storage exchange_table_bytes=28100 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:19:44.718311Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=59 success=true
2026-09-12T18:19:44.718354Z  INFO local_candidate{attempt=53}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10008 exchange_table_bytes=28100 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:19:44.718368Z  INFO local_candidate{attempt=53}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28100 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10008 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:19:44.880404Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=52 success=true
2026-09-12T18:19:44.880444Z  INFO local_candidate{attempt=54}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=9968 exchange_table_bytes=28132 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:19:44.880457Z  INFO local_candidate{attempt=54}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=28132 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9968 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:19:44.961756Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=51 success=true
2026-09-12T18:19:44.961794Z  INFO local_candidate{attempt=49}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10088 exchange_table_bytes=27512 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:19:44.961807Z  INFO local_candidate{attempt=49}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27512 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10088 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:19:45.180646Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=462 success=true
2026-09-12T18:19:45.186667Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:45.192291Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:45.195086Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:45.195634Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:45.195650Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.195825Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:45.197156Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:45.199511Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:45.200401Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:45.201419Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:45.201696Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:45.202008Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:45.202015Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.203146Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:45.204308Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:45.214871Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:45.215704Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:45.216047Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:45.216148Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:45.216157Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.217316Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:45.221785Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:45.224717Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:45.226097Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:45.226111Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.227164Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:45.227286Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:45.227545Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:45.227553Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.227593Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:45.227601Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.228256Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:45.228669Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:45.228981Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:45.232376Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:45.232421Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:45.232872Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:45.232880Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.233952Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:45.236624Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:45.236725Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:45.237838Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:45.237865Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.238903Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:45.240918Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:45.242647Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:45.243132Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:45.243555Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:45.243566Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.244924Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:45.249789Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:45.250798Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:45.254250Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:45.255028Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:45.255039Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.256851Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:45.299918Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:45.306038Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:45.306059Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.316491Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:45.352040Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:45.353442Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:45.353461Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.357681Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:45.368405Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:45.371914Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:45.371932Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.377285Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:45.432891Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:45.434568Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:45.434580Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.436113Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:45.437730Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:45.445964Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:45.445986Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.459526Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:45.481218Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:45.481258Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:45.500431Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:19:45.575570Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:45.576505Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:45.576525Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.578979Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:45.590717Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:45.593722Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:45.593742Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.597761Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:45.608249Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:45.611117Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:45.616663Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:45.616682Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.621009Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:45.621448Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:45.621461Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.622987Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:45.623690Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:45.649446Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:45.657833Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:45.657857Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.674044Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:45.767374Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:45.790821Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:45.793687Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:45.793705Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.807552Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:19:45.807570Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.816332Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:19:45.820119Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:45.838351Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:45.838383Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:45.851835Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:45.852779Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:45.852792Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.855050Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:45.869149Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:19:45.897709Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:45.917935Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:45.917958Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:45.945931Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:45.980371Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:45.997954Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:45.997983Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.005460Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:46.029918Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:19:46.029950Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:46.037537Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:19:46.053643Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:46.062130Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:46.067185Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:46.067224Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.076451Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:46.080349Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:46.080366Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.095262Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:46.100459Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:46.101431Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:46.101444Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.103175Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:46.109150Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:46.118104Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:46.118123Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.149055Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:46.209360Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:46.238654Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:46.238682Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.272982Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:46.273680Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=516 success=true
2026-09-12T18:19:46.273718Z  INFO local_candidate{attempt=51}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10008 exchange_table_bytes=28100 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:19:46.273733Z  INFO local_candidate{attempt=51}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28100 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10008 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:19:46.273755Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=499 success=true
2026-09-12T18:19:46.273773Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=473 success=true
2026-09-12T18:19:46.273783Z  INFO local_candidate{attempt=52}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10008 exchange_table_bytes=28100 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:19:46.273794Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=481 success=true
2026-09-12T18:19:46.273800Z  INFO local_candidate{attempt=48}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10088 exchange_table_bytes=27512 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:19:46.273802Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=265 success=true
2026-09-12T18:19:46.273827Z  INFO local_candidate{attempt=52}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28100 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10008 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:19:46.273871Z  INFO local_candidate{attempt=50}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10008 exchange_table_bytes=28100 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:19:46.273841Z  INFO local_candidate{attempt=47}: placing generated tile programs linked_end=385708 host_code_base=385712 host_code_bytes=8892 generated_code_bytes=10088 exchange_table_bytes=27512 executable_ranges=[(377220, 377224), (377612, 377616), (378924, 378928), (380980, 380984), (382716, 382720), (384732, 384736), (385708, 385712), (394672, 524288)]
2026-09-12T18:19:46.273856Z  INFO local_candidate{attempt=48}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27512 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10088 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:19:46.273883Z  INFO local_candidate{attempt=50}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=28100 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10008 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:19:46.273887Z  INFO local_candidate{attempt=47}: allocated package support memory linked_end=385708 profile_bytes=0 exchange_table_bytes=27512 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10088 code_address=394672 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:19:46.341668Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:46.365397Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:46.365420Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.379718Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:46.587897Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:46.623196Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:46.623237Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.648624Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:46.652314Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:46.678722Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:46.678745Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.712781Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:46.877619Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=1915 success=true
2026-09-12T18:19:46.881284Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:46.894799Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:46.899822Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:46.900813Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:46.900832Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.900850Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:46.901318Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:46.902192Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:46.902226Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.903166Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:46.904554Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:46.909116Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:46.909796Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:46.909819Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.911963Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:46.914600Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:46.922001Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:46.922480Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:46.922497Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.924167Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:46.927759Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:46.927877Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=654 success=true
2026-09-12T18:19:46.931110Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:46.931130Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.931606Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=657 success=true
2026-09-12T18:19:46.932160Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:46.933624Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=659 success=true
2026-09-12T18:19:46.934043Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=660 success=true
2026-09-12T18:19:46.936911Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:46.937739Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:46.938885Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:46.938906Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.939281Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:46.939407Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=665 success=true
2026-09-12T18:19:46.941127Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:46.941988Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:46.942264Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:46.956934Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:46.957489Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:46.957507Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:46.958844Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:46.961965Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:46.978516Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:46.989646Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:46.998354Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:47.005531Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:47.005555Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.014619Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:47.017100Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:47.035609Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:47.036172Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:47.036184Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.037737Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:47.076532Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:47.077837Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:47.077858Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.080358Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:47.331104Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:47.342007Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:47.342037Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.364266Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:47.409173Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:47.465765Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:47.465811Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.513940Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:47.535688Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:47.535728Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:47.549214Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:47.549269Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.560589Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:47.564957Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:47.583278Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:47.584335Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:19:47.636025Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:47.636062Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.674335Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:47.685727Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:47.687118Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:47.687531Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:47.687549Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.698529Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:47.698766Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:47.703326Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:47.703361Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.716904Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:47.716947Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.718918Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:47.733370Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:47.734776Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:47.736185Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:47.736221Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.736881Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:47.737146Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:47.738000Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:47.738017Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.738915Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:47.740398Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:47.742228Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:47.742267Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:47.742283Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.747582Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:47.748277Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:47.748574Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:47.748586Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.750343Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:47.755376Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:47.755394Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.758664Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:47.761944Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:47.762441Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:47.762909Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:47.762917Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.763022Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:47.763034Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.763784Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:47.764904Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:47.765330Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:47.769041Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:47.772165Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:47.772184Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.780221Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:47.780736Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:47.780743Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.782190Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:47.782527Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:47.782657Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:47.787820Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:47.787839Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.790058Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:47.791042Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:47.791055Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.792169Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:19:47.792829Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:47.794703Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:47.800830Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:47.800866Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:47.803946Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:47.805198Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:19:47.805231Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.808339Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:47.809374Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:47.809386Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.811174Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:47.814479Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:47.814844Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:47.814851Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.815174Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:19:47.815497Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:47.815939Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:47.817622Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:47.817634Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.819855Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:47.821254Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:47.825659Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:47.827535Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:47.835069Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:19:47.835104Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:47.839557Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:19:47.840550Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:47.840562Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.842283Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:19:47.962678Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:47.970410Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:47.970432Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.973988Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:47.981588Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:47.981810Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:47.981826Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:47.993064Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:48.011390Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:19:48.015107Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:48.020896Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:19:48.020919Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.023038Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:48.023057Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.030430Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:19:48.034422Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:48.045298Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:48.058543Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:48.058632Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.068330Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:48.077255Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:48.078510Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:48.079870Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:19:48.082648Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:48.082668Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.087888Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:19:48.087906Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.089827Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:48.099378Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:19:48.110959Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:48.111678Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:48.111692Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.113806Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:48.126103Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:48.126600Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:48.126610Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.127965Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:48.137770Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:48.137797Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.174815Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:48.189869Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:48.279010Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:48.291463Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:48.303922Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:48.305901Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:48.311318Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:48.311339Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.328527Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:19:48.328573Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.330302Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:48.330336Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.331158Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:48.343540Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:19:48.377898Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:48.378625Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:48.378651Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.382627Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:48.384916Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:48.384935Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.387751Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:48.411863Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:48.433671Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:48.433696Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.453364Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:48.466732Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:48.479737Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:48.498999Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:48.499042Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.502011Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:48.510951Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:48.510977Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.519747Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:48.522004Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:48.522020Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.525287Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:48.529766Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:48.539526Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:48.547426Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:48.547782Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:48.548523Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:48.548538Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.549978Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:48.572638Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:48.572668Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.634958Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:48.663560Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:48.669047Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:48.681113Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:48.694700Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:48.699077Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:48.703847Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:48.704276Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:48.704293Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.704837Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:48.704852Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.706833Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:48.706852Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.708153Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:48.710187Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:48.722558Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:48.725993Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:48.726708Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:48.726724Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.728528Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:48.737600Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:48.738678Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:48.739127Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:48.739135Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.740333Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:48.745527Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:48.745682Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:48.747711Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:48.748721Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:48.758793Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:48.759363Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:48.759375Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.761330Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:48.765146Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:48.854590Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:48.870662Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:48.877269Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:48.877293Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.890798Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:48.913734Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:48.914561Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:48.914579Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.916733Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:48.928800Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:48.928846Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.964799Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:48.966370Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:48.966404Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:48.969403Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:48.977342Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:49.002971Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:49.002999Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.026767Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:49.029173Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:49.031912Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:49.036792Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:49.052444Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:49.060184Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:49.065039Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:49.065076Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.072253Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:49.072428Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:49.072813Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:49.072820Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.073555Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:49.073569Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.073802Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:49.073819Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.074882Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:49.076249Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:49.083066Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:49.084903Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:49.085286Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:49.085295Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.086335Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:49.090309Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:49.091485Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:49.097151Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:49.098958Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:49.099762Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:49.115137Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:49.116976Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:49.120506Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:49.120533Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.121055Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:49.123028Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:49.126482Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:49.128633Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:49.132846Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:49.142501Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:49.142523Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.142744Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:49.149641Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:49.149661Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.151881Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:49.152702Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:49.152723Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.153638Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:49.155040Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:49.155053Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.155534Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:49.156103Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:49.156113Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.157441Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:49.157489Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:49.157876Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:49.163376Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:49.165087Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:49.168355Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:49.179510Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:49.183685Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:49.183703Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.183749Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:49.187463Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:49.191439Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:49.204520Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:49.204926Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:49.204935Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.206111Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:49.206632Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:49.208824Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:49.208849Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.208823Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:49.211872Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:49.218553Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:49.219278Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:49.220707Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:49.220724Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.221950Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:49.223196Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:49.223229Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.223609Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:49.225862Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:49.230450Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:49.232577Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:49.232743Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:49.233219Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:49.233545Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:49.233554Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.235381Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:49.240464Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:49.263366Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:49.275108Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:49.275144Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.275334Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:49.275358Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.285423Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:49.286671Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:49.294984Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:49.295009Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.295044Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:49.296174Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:49.305486Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:49.305516Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:49.306595Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:49.310881Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:49.321832Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:49.341556Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:49.342446Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:49.342460Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.344898Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:49.389305Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:49.414831Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:19:49.427393Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:49.427440Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.434011Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:49.460759Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:49.460791Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.461128Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:49.461689Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:49.461705Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.462935Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:49.469413Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:49.472240Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:49.479955Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:49.484129Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:49.484277Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:49.484774Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:49.484786Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.486967Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:49.489674Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:49.489690Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.495631Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:49.499027Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:49.505234Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:49.505253Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.512051Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:19:49.512541Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:49.513378Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:19:49.513392Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.516109Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:19:49.522654Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:49.522912Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:19:49.529529Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:49.531750Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:49.531764Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.533461Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:49.533884Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:49.533898Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.534276Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:49.534780Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:49.539645Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:49.565321Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:49.573343Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:19:49.582944Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:49.583467Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:49.583479Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.584025Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:19:49.584987Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:49.717844Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:19:49.735074Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:49.756609Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:49.756644Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.766065Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:49.766096Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.791365Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:49.804253Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:19:49.829366Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:49.830143Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:49.830155Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.831175Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:49.841998Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:49.863005Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:49.867349Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:49.867370Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.881221Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:49.884451Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:49.884472Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.886434Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:49.886453Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:49.889517Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:49.893509Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:49.916062Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:50.037686Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:50.045888Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:50.045935Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.056239Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:50.114590Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:50.116512Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:50.130348Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:50.130373Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.135654Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:50.135680Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.138469Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:50.144967Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:50.148243Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:50.160435Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:50.161156Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:50.161166Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.163197Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:50.168880Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:50.168899Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.174705Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:50.175158Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:50.175173Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.176483Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:50.181936Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:50.186509Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:50.197045Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:50.265988Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:50.266024Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:50.271598Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:50.295970Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:19:50.308550Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:50.314454Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:50.314477Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.343859Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:50.343915Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.354450Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:50.379662Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:50.431583Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:50.462953Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:19:50.462991Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:50.466215Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:50.466249Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.471281Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:19:50.509504Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:50.544644Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:50.545625Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:50.545640Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.548086Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:50.570181Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:50.570229Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:50.583644Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:19:50.693611Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:50.703848Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:50.703870Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.721128Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:50.722897Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:50.747493Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:50.747515Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.778802Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:50.865906Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:50.897715Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:50.897751Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:50.927783Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:51.038026Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:51.092894Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:51.092926Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.124330Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:51.161069Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:51.161094Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.165487Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:51.187662Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:51.194014Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:51.208246Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:51.222407Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:51.238458Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:51.238983Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:51.238994Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.240543Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:51.240567Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.240627Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:51.251876Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:51.252324Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:51.252336Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.253396Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:51.259276Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:51.266051Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:51.266081Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.273718Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:51.274343Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:51.274357Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.276607Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:51.289591Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:51.289904Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:51.335721Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:51.366149Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:19:51.366185Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.379409Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:51.394610Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:51.395107Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:51.395117Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.396684Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:51.458246Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:51.464454Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:51.464476Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.475955Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:51.490919Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:51.501588Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:19:51.505595Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:51.506143Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:51.506155Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.507463Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:51.514357Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:51.552759Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:51.559475Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:51.565736Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:51.566159Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:51.566168Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.567600Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:51.570038Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:51.570462Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:51.570478Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.577082Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:51.588698Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:51.588991Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:51.589367Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:51.589378Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.590842Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:51.599648Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:51.600282Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:51.600618Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:51.600626Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.601616Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:51.606529Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:51.610861Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:51.612073Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:51.612658Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:51.622323Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:51.633380Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:51.633403Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.666096Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:51.683892Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:51.687852Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:51.687871Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.695457Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:51.713042Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:51.713743Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:51.713761Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.715604Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:51.726937Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:51.746690Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:51.747481Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:51.747495Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.748955Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:51.759466Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:51.759497Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.796265Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:51.803606Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:51.819807Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:51.820332Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:51.820341Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.821617Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:51.856055Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:51.856089Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.873922Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:51.876267Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:51.876283Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:51.878815Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:51.923746Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:52.005389Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:52.009756Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:52.021695Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:52.021722Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.041120Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:52.054946Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:52.054969Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.131841Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:52.177523Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:52.193514Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:52.194015Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:52.194031Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.195617Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:52.207324Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:52.207758Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:52.207771Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.208828Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:52.214311Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:52.228535Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:52.229161Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:52.229173Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.231525Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:52.262413Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:52.285289Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:19:52.285314Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.298473Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:19:52.298863Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:52.349050Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:52.349087Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:52.394764Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:19:52.423867Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:19:52.423900Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.470288Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:52.482644Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:52.482669Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.489264Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:52.507687Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:52.508258Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:52.508271Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.510064Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:52.520726Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:52.521132Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:52.521140Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.522106Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:52.527086Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:52.531453Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:52.601510Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:19:52.629814Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:52.649425Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:52.672475Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:52.681160Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:52.681190Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.683266Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:52.683291Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.722455Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:52.747890Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:52.747923Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.754214Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:52.754795Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:52.754803Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.756135Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:52.766880Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:52.811852Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:52.814186Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:52.814215Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.816901Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:52.843216Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:52.889986Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:52.890924Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:52.890938Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.893346Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:52.925501Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:52.927450Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:52.927477Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.930676Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:52.952639Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:52.997462Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:52.997496Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:52.998098Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:52.998125Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:53.011698Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:19:53.018257Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:53.025449Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:53.039235Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:53.039711Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:53.039719Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.041309Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:53.046258Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:53.051852Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:53.052250Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:53.052259Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.053303Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:53.056039Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:53.058752Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:53.063531Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:53.064909Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:53.065559Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:53.075768Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:53.075953Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:53.081540Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:53.081562Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.086411Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:53.086431Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.088774Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:53.098721Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:53.109257Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:53.109687Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:53.109695Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.110598Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:53.111547Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:53.115277Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:53.123001Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:53.140001Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:53.144195Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:53.144229Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.146573Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:53.147086Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:53.147093Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.147430Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:53.147452Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.148618Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:53.151844Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:53.172891Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:53.173639Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:53.173661Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.175737Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:53.195457Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:53.203552Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:53.204449Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:53.204463Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.206376Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:53.220817Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:53.229234Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:53.236767Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:53.236791Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.242389Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:53.243552Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:19:53.243572Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.245601Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:53.245617Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.247124Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:53.248862Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:53.256855Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:19:53.261018Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:53.277879Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:53.278489Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:53.278504Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.279934Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:53.285723Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:53.472042Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:53.528177Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:53.528213Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.617019Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:53.699071Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:53.720666Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:19:53.720694Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.731674Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:19:53.768668Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:53.810414Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:53.840347Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:53.840383Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.846772Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:53.846793Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.848736Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:19:53.883794Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:53.883830Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:53.891532Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:53.899120Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:53.915671Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:19:53.936072Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:53.950579Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:53.950605Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.958475Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:53.977982Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:53.978025Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:53.984114Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:53.985414Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:53.985436Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:53.989465Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:54.005056Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:54.005585Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:54.005598Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:54.006781Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:54.012772Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:54.017702Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:54.037915Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:19:54.085668Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:19:54.085704Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:54.088910Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:54.094537Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:19:54.132405Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:54.132429Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:54.166323Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:54.393304Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:54.393341Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:54.419571Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:19:54.462488Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:54.462526Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:54.483161Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:54.489062Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:54.489099Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:54.535433Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:19:54.549993Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:19:54.550171Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:19:54.550921Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:54.550945Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:54.560976Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:19:54.560995Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:54.572981Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:19:54.641404Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:54.686053Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:54.687152Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:54.687166Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:54.689784Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:54.701883Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:19:54.702336Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:54.702345Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:54.703599Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:19:54.759824Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:19:54.786864Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:54.793534Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:54.813481Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:54.813507Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:54.824671Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:54.824703Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:54.844235Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:54.859186Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:54.861821Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:54.948243Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:19:54.948268Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.062696Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:55.116912Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:19:55.125811Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:55.127467Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:55.127488Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.153214Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:55.153256Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:55.168829Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:55.168858Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.170977Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:55.185599Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:19:55.197806Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:55.197836Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.203531Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:55.220316Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:55.223455Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:55.264632Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:55.307016Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:55.307047Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.355092Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:55.374312Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:55.379152Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:55.379170Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.383315Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:55.384582Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:55.412358Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:55.412388Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.445007Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:55.458539Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:55.458574Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:55.474731Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:19:55.617321Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:55.673884Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:19:55.701304Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:55.701345Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.764119Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:55.799393Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:55.799429Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:55.811182Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:55.812551Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:55.812568Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.815161Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:55.852224Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:19:55.908293Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:55.909527Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:55.909544Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.911906Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:55.934380Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:55.935430Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:55.935444Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.937947Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:55.953578Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:19:55.977787Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:19:55.977810Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:55.997306Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:19:56.046851Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:19:56.049043Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:19:56.049059Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:56.051674Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:19:56.193460Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:56.230268Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:56.257128Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:56.257153Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:56.258934Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:56.258954Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:56.289819Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:56.352538Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:56.370667Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:56.370706Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:56.382834Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:56.455744Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:19:56.464569Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:56.464609Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:56.562636Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:56.592102Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:56.635090Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:56.669588Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:56.669626Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:56.707244Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:56.707281Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:56.716507Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:19:56.739775Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:19:56.739798Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:56.771062Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:19:56.785305Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:56.803738Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:56.901788Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:56.934713Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:56.934747Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:56.964134Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:57.104700Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:57.140637Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:57.140670Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.141970Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:19:57.178994Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:57.217827Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:57.219225Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:57.219242Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.220330Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:19:57.221851Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:57.229547Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:19:57.245786Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:19:57.245817Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.258030Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:57.258061Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:57.272157Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:19:57.274829Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:19:57.285831Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:19:57.285849Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.302756Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:19:57.305385Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:19:57.321980Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:19:57.329041Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:57.329076Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:57.362374Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:57.362411Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:57.362728Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:19:57.362761Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:57.368755Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:19:57.399227Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:19:57.409972Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:19:57.436198Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:19:57.439106Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:57.440271Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:57.440287Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.441656Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:19:57.441679Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.442630Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:57.445923Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:57.445949Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:57.447892Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:19:57.479369Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:19:57.493425Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:19:57.494069Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:57.494094Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:57.515662Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:19:57.515685Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.523047Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:19:57.557614Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:19:57.560361Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:19:57.581666Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:19:57.588815Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:19:57.600687Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:19:57.601073Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:57.601082Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.602546Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:19:57.612056Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:19:57.612429Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:57.612438Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.613370Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:19:57.617786Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:57.618324Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:19:57.620124Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:57.622759Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:19:57.623983Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:19:57.624567Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:19:57.633932Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:19:57.639605Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:19:57.644068Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:57.644089Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.661809Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:57.661839Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.671894Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:57.675274Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:19:57.681324Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:57.681348Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:57.691179Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:19:57.691217Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.693980Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:19:57.696417Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:57.698008Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:19:57.698023Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.704977Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:19:57.705646Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:19:57.711009Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:57.715612Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:57.717470Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:19:57.717854Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:19:57.717861Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.718904Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:19:57.727475Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:19:57.738992Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:57.739009Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.743922Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:19:57.744671Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:19:57.744682Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.746434Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:19:57.764841Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:19:57.764872Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:57.767838Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:57.776889Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:57.776912Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.787071Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:19:57.787538Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:19:57.787548Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.788526Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:19:57.793619Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:19:57.797791Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:19:57.800732Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:57.810622Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:19:57.811069Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:19:57.811077Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.813066Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:19:57.820247Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:57.822239Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:57.824896Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:57.824912Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.827987Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:19:57.830177Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:57.844436Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:19:57.862934Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:57.883953Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:19:57.884985Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:19:57.885008Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.887257Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:19:57.895499Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:57.895525Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.895680Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:57.896578Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:57.896594Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.899252Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:57.907081Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:57.907111Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:57.911831Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:57.912252Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:57.912260Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.913482Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:57.914620Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:19:57.914645Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.915888Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:19:57.915916Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:57.920153Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:19:57.953377Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:57.965391Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:19:58.010429Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:58.014584Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:58.014598Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.018229Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:58.030792Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:19:58.031231Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:19:58.031242Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.032315Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:19:58.035527Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:58.036938Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:58.037636Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:19:58.039939Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:19:58.050899Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:19:58.051458Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:19:58.051469Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.053466Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:19:58.061139Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:58.061159Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.062304Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:58.062323Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.090180Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:58.093944Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:58.104557Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:19:58.104591Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:58.137672Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:19:58.138138Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:19:58.151010Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:58.151040Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:58.161390Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:19:58.161411Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.162775Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:19:58.163816Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:19:58.165188Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:19:58.165221Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.167742Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:19:58.181449Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:19:58.182045Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:19:58.182054Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.183163Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:19:58.188620Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:19:58.189699Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:19:58.209122Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:19:58.214482Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:19:58.214502Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.220876Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:19:58.227345Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:19:58.235306Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:58.240533Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:19:58.247670Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:19:58.248568Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:19:58.248622Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.251810Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:19:58.272973Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:58.273007Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.276305Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:19:58.277392Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:19:58.277405Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.279973Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:19:58.298327Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:19:58.298360Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:58.307073Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:19:58.309146Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:58.337836Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:19:58.337868Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.351045Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:58.371362Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:19:58.371384Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.375724Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:19:58.383165Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:19:58.385036Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:19:58.398030Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:19:58.398467Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:19:58.398479Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.399925Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:19:58.436322Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:19:58.436358Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.492667Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:19:58.495410Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:19:58.505780Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:19:58.505801Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.512483Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:19:58.513811Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:19:58.538856Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:19:58.538887Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.539996Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:19:58.550374Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:19:58.578917Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:19:58.578953Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:58.588776Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:19:58.590034Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:19:58.603192Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:19:58.603237Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:19:58.637173Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:19:58.637195Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.679255Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:19:58.702561Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:19:58.759181Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:58.785532Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:58.785556Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:58.816614Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:58.975178Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:58.993019Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:19:59.015571Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:19:59.026282Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:19:59.026305Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:59.041819Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:19:59.041856Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:59.043881Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:59.043902Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:59.055457Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:19:59.075436Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:19:59.082568Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:19:59.107815Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:19:59.107837Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:59.134306Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:19:59.138415Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:19:59.336539Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:59.376550Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:59.376577Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:59.408721Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:59.594147Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:19:59.633357Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:19:59.641760Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:19:59.641792Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:59.668583Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:19:59.668606Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:59.674113Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:19:59.712652Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:19:59.713560Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:19:59.778241Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:19:59.778264Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:19:59.875561Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:20:00.095667Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:00.095705Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:00.134248Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:20:00.178175Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:20:00.180038Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:20:00.180069Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:00.203383Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:20:00.203409Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:00.206237Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:20:00.284281Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:20:00.665592Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:20:00.672766Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:20:00.725014Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:20:00.725042Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:00.767524Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:20:00.767557Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:00.767795Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:20:00.891615Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:20:01.255689Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:01.255727Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:01.333773Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:20:01.563737Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:01.563775Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:01.630987Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:20:01.635414Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:20:01.661130Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:20:01.661147Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:01.689670Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:20:01.705029Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=14765 success=true
2026-09-12T18:20:01.880535Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:20:01.888906Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:20:01.888924Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:01.902109Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:20:04.957589Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:20:05.066053Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:20:05.066091Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.218405Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:20:05.252979Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18321 success=true
2026-09-12T18:20:05.254653Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18326 success=true
2026-09-12T18:20:05.254808Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18321 success=true
2026-09-12T18:20:05.254828Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18320 success=true
2026-09-12T18:20:05.255087Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18377 success=true
2026-09-12T18:20:05.255125Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=20074 success=true
2026-09-12T18:20:05.431350Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=20550 success=true
2026-09-12T18:20:05.435428Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:20:05.445551Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:20:05.446082Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:05.446096Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.446739Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:20:05.447172Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:20:05.451616Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:20:05.452492Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:20:05.452503Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:05.452518Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.454736Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:05.457958Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:20:05.462495Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:20:05.463782Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:20:05.463795Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.464088Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:20:05.465529Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:20:05.466145Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:20:05.466154Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.466929Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:20:05.467914Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:20:05.467991Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:20:05.468596Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:05.468613Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.470817Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:20:05.481877Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:20:05.483829Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:20:05.484620Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:20:05.484635Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.484745Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:20:05.485285Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:05.485300Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.486803Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:20:05.487092Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:20:05.494440Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:20:05.494950Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:20:05.501321Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:20:05.503087Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:20:05.503907Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:20:05.526218Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:20:05.549315Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:20:05.612677Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:20:05.617628Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:20:05.617648Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.623605Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:20:05.631986Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:20:05.639385Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:20:05.641391Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:20:05.641750Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:20:05.641758Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.642543Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:20:05.644802Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:20:05.644820Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.646850Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:20:05.654565Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:20:05.662273Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:20:05.662301Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:05.668088Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:20:05.668142Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:20:05.668869Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:20:05.668881Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.671532Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:20:05.671563Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:20:05.672099Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:20:05.672109Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.673630Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:20:05.706659Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:20:05.718352Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:20:05.718378Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.723554Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:20:05.724632Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:20:05.724650Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.727001Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:20:05.731394Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:20:05.931532Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:20:05.938043Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:20:05.938076Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:05.947259Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:20:06.043916Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:20:06.072593Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:20:06.072630Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.087324Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:20:06.101936Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:20:06.114117Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:20:06.114154Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.115617Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:20:06.141458Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:20:06.141484Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.143750Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:20:06.153464Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:20:06.154922Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:20:06.154937Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.157390Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:20:06.162002Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:20:06.173269Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:20:06.173287Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.176118Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:20:06.179540Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:20:06.206050Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:20:06.206657Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:20:06.206670Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.208494Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:20:06.218441Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:20:06.218821Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:06.218832Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.219725Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:20:06.224468Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:20:06.226072Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:20:06.250496Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:20:06.251172Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:06.251183Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.252880Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:20:06.292085Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:20:06.294031Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:20:06.294047Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.296073Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:20:06.361609Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:20:06.361650Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:06.398961Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:20:06.601851Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:20:06.614977Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:20:06.621866Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:20:06.621896Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.635482Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:20:06.635505Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.635536Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:20:06.654821Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:20:06.805397Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:20:06.831562Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:20:06.845893Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:20:06.845922Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.846487Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:20:06.864977Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:06.865015Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.874802Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:06.874829Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.883822Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:20:06.913761Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:20:06.914271Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:20:06.924632Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:20:06.936100Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:20:06.936123Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:06.953265Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:20:07.001724Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:20:07.035918Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:20:07.035956Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:07.073400Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:20:07.144059Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:20:07.147558Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:20:07.174120Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:20:07.174144Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:07.189681Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:20:07.189712Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:07.203083Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:20:07.220901Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:20:07.271065Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:20:07.271112Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:07.288350Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:20:07.811939Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:20:07.876900Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:20:07.876938Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:07.929638Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:20:08.067109Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:20:08.067152Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:08.106221Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:20:08.515762Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:20:08.576266Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:20:08.576292Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:08.666190Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:20:09.328996Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:20:09.414775Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:20:09.414808Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:09.568780Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:20:10.801156Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:10.801197Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:10.878910Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:20:12.527407Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:20:12.528575Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:20:12.566805Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:20:12.566889Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:12.580022Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:20:12.580051Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:12.615034Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:20:12.640793Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:20:12.987773Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=11282 success=true
2026-09-12T18:20:13.020692Z  INFO local_candidate{attempt=50}: costed final placed program final_cycles=11824809 final_exchange=4924747
2026-09-12T18:20:13.230261Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:20:13.356827Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:20:13.356864Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:13.402172Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:20:14.244522Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=103 success=true
2026-09-12T18:20:14.332908Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=88 success=true
2026-09-12T18:20:14.832400Z  INFO local_candidate{attempt=50}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=451 success=true
2026-09-12T18:20:15.230296Z  INFO local_candidate{attempt=50}: retained faster incumbent candidate_cycles=11824809 cycles=11824809
2026-09-12T18:20:15.778576Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:20:15.877315Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:20:15.877341Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:15.894899Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10640 success=true
2026-09-12T18:20:15.897514Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10644 success=true
2026-09-12T18:20:15.919274Z  INFO local_candidate{attempt=47}: costed final placed program final_cycles=12055659 final_exchange=4939543
2026-09-12T18:20:15.919494Z  INFO local_candidate{attempt=48}: costed final placed program final_cycles=12055659 final_exchange=4939543
2026-09-12T18:20:15.922984Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10668 success=true
2026-09-12T18:20:15.942687Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10687 success=true
2026-09-12T18:20:15.958449Z  INFO local_candidate{attempt=51}: costed final placed program final_cycles=11824809 final_exchange=4924747
2026-09-12T18:20:15.969401Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:20:15.975921Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10720 success=true
2026-09-12T18:20:15.976246Z  INFO local_candidate{attempt=53}: costed final placed program final_cycles=11824809 final_exchange=4924747
2026-09-12T18:20:15.998571Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:20:15.999214Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:15.999238Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:16.000674Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:20:16.007827Z  INFO local_candidate{attempt=49}: costed final placed program final_cycles=12055659 final_exchange=4939543
2026-09-12T18:20:16.044930Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10790 success=true
2026-09-12T18:20:16.068936Z  INFO local_candidate{attempt=52}: costed final placed program final_cycles=11824809 final_exchange=4924747
2026-09-12T18:20:16.697296Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:20:16.712753Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:20:16.712777Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:16.722013Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:20:16.767761Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:20:16.769015Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:16.769031Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:16.771620Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:20:16.774724Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=11343 success=true
2026-09-12T18:20:17.481132Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=410 success=true
2026-09-12T18:20:17.481158Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=373 success=true
2026-09-12T18:20:17.481236Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=384 success=true
2026-09-12T18:20:17.481280Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=286 success=true
2026-09-12T18:20:17.481291Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=421 success=true
2026-09-12T18:20:17.481395Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=448 success=true
2026-09-12T18:20:17.559509Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=78 success=true
2026-09-12T18:20:17.559608Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=78 success=true
2026-09-12T18:20:17.560157Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=78 success=true
2026-09-12T18:20:17.560459Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=79 success=true
2026-09-12T18:20:17.561607Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=80 success=true
2026-09-12T18:20:17.596798Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=115 success=true
2026-09-12T18:20:18.027845Z  INFO local_candidate{attempt=53}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=408 success=true
2026-09-12T18:20:18.028798Z  INFO local_candidate{attempt=52}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=403 success=true
2026-09-12T18:20:18.050619Z  INFO local_candidate{attempt=51}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=417 success=true
2026-09-12T18:20:18.055100Z  INFO local_candidate{attempt=49}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=438 success=true
2026-09-12T18:20:18.084434Z  INFO local_candidate{attempt=48}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=460 success=true
2026-09-12T18:20:18.086374Z  INFO local_candidate{attempt=47}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=416 success=true
2026-09-12T18:20:18.298756Z  INFO local_candidate{attempt=49}: retained faster incumbent candidate_cycles=12055659 cycles=11824809
2026-09-12T18:20:18.325504Z  INFO local_candidate{attempt=52}: retained faster incumbent candidate_cycles=11824809 cycles=11824809
2026-09-12T18:20:18.337295Z  INFO local_candidate{attempt=53}: retained faster incumbent candidate_cycles=11824809 cycles=11824809
2026-09-12T18:20:18.394033Z  INFO local_candidate{attempt=48}: retained faster incumbent candidate_cycles=12055659 cycles=11824809
2026-09-12T18:20:18.422280Z  INFO local_candidate{attempt=51}: retained faster incumbent candidate_cycles=11824809 cycles=11824809
2026-09-12T18:20:18.471108Z  INFO local_candidate{attempt=47}: retained faster incumbent candidate_cycles=12055659 cycles=11824809
2026-09-12T18:20:26.864614Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10089 success=true
2026-09-12T18:20:26.898777Z  INFO local_candidate{attempt=54}: costed final placed program final_cycles=11823228 final_exchange=4924624
2026-09-12T18:20:28.164108Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=76 success=true
2026-09-12T18:20:28.255038Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=90 success=true
2026-09-12T18:20:28.702519Z  INFO local_candidate{attempt=54}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=389 success=true
2026-09-12T18:20:28.937408Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: accepted local layout improvement attempt=54 before=11824809 after=11823228 changed_operations=[] opened_boundaries=[]
2026-09-12T18:20:29.760423Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: saved mid-plan search state path=artifacts/search-state-20260912/bs1/state.json attempts=55 bytes=22033577
2026-09-12T18:20:31.543708Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-55-candidate-0-480354-0075.json scope="local-55-candidate-0" peak_step=63 effective_peak_bytes=472824
2026-09-12T18:20:31.591033Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-55-candidate-1-480354-0076.json scope="local-55-candidate-1" peak_step=63 effective_peak_bytes=472824
2026-09-12T18:20:31.645798Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-55-candidate-2-480354-0077.json scope="local-55-candidate-2" peak_step=63 effective_peak_bytes=472824
2026-09-12T18:20:31.692745Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-55-candidate-3-480354-0078.json scope="local-55-candidate-3" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:20:31.739484Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-55-candidate-4-480354-0079.json scope="local-55-candidate-4" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:20:31.792101Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-55-candidate-5-480354-0080.json scope="local-55-candidate-5" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:20:31.846873Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-55-candidate-6-480354-0081.json scope="local-55-candidate-6" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:20:31.894726Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: wrote planner memory profile path=artifacts/search-state-20260912/bs1/extended/memory/local-55-candidate-7-480354-0082.json scope="local-55-candidate-7" peak_step=73 effective_peak_bytes=462584
2026-09-12T18:20:31.895031Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: evaluating ordered local candidates concurrently candidates=8 threads=24
2026-09-12T18:20:38.739246Z  INFO local_candidate{attempt=61}: screened exchange table geometry expansion_ms=5607 expansion_and_footprint_ms=6844 estimated_row_bytes=37752 heuristic_row_bytes=104884 geometry_fragments_per_tile=4329 fragment_limit=16384
2026-09-12T18:20:38.749317Z  INFO local_candidate{attempt=57}: screened exchange table geometry expansion_ms=5751 expansion_and_footprint_ms=6854 estimated_row_bytes=37592 heuristic_row_bytes=102580 geometry_fragments_per_tile=4307 fragment_limit=16384
2026-09-12T18:20:38.775495Z  INFO local_candidate{attempt=56}: screened exchange table geometry expansion_ms=5740 expansion_and_footprint_ms=6880 estimated_row_bytes=37592 heuristic_row_bytes=102580 geometry_fragments_per_tile=4307 fragment_limit=16384
2026-09-12T18:20:38.809786Z  INFO local_candidate{attempt=55}: screened exchange table geometry expansion_ms=5791 expansion_and_footprint_ms=6914 estimated_row_bytes=37592 heuristic_row_bytes=102580 geometry_fragments_per_tile=4307 fragment_limit=16384
2026-09-12T18:20:38.856745Z  INFO local_candidate{attempt=61}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:20:38.868660Z  INFO local_candidate{attempt=57}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:20:38.894911Z  INFO local_candidate{attempt=56}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:20:38.932117Z  INFO local_candidate{attempt=55}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:20:39.066425Z  INFO local_candidate{attempt=59}: screened exchange table geometry expansion_ms=5948 expansion_and_footprint_ms=7171 estimated_row_bytes=37752 heuristic_row_bytes=104884 geometry_fragments_per_tile=4329 fragment_limit=16384
2026-09-12T18:20:39.187663Z  INFO local_candidate{attempt=59}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:20:39.473306Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:20:39.480772Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:20:39.484989Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:20:39.485421Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:20:39.485713Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:39.485724Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.486880Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:20:39.486982Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:20:39.491434Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:20:39.492505Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:39.492521Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.493497Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:20:39.493708Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:20:39.494369Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:20:39.494606Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:20:39.494617Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.494841Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:39.494888Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:39.494901Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.496528Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:39.496840Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:20:39.500123Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:20:39.501656Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:20:39.501669Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.504341Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:20:39.505274Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:20:39.505842Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:39.505853Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.506060Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:20:39.506614Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:39.506630Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.507532Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:20:39.508072Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:39.508150Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:20:39.508160Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.508303Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:20:39.510017Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:20:39.522740Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:20:39.523323Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:39.523342Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.524929Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:20:39.532884Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:20:39.540500Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:20:39.542535Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:20:39.542547Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:20:39.543536Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:20:39.566892Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:20:39.570552Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:20:39.578914Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:20:39.583247Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:20:39.660327Z  INFO local_candidate{attempt=62}: screened exchange table geometry expansion_ms=6533 expansion_and_footprint_ms=7765 estimated_row_bytes=37752 heuristic_row_bytes=104884 geometry_fragments_per_tile=4329 fragment_limit=16384
2026-09-12T18:20:39.682679Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:20:39.688469Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:20:39.688491Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.691144Z  INFO local_candidate{attempt=58}: screened exchange table geometry expansion_ms=6449 expansion_and_footprint_ms=7795 estimated_row_bytes=37736 heuristic_row_bytes=104952 geometry_fragments_per_tile=4331 fragment_limit=16384
2026-09-12T18:20:39.698827Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:20:39.718579Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:20:39.719271Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:20:39.719293Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.721356Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:20:39.724733Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:20:39.738652Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:20:39.738684Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.757699Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:20:39.764290Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:20:39.765521Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:20:39.765539Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:39.767691Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:20:39.797638Z  INFO local_candidate{attempt=62}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:20:39.825530Z  INFO local_candidate{attempt=56}: compared ordinary and paired exchange schedules phase=22 candidates=18 ordinary_horizon=2545 paired_horizon=2330 use_paired=false
2026-09-12T18:20:39.837145Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:20:39.837169Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:39.842046Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:20:39.874177Z  INFO local_candidate{attempt=58}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:20:39.908917Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:20:39.908952Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:39.933391Z  INFO local_candidate{attempt=60}: screened exchange table geometry expansion_ms=6790 expansion_and_footprint_ms=8038 estimated_row_bytes=37752 heuristic_row_bytes=104884 geometry_fragments_per_tile=4329 fragment_limit=16384
2026-09-12T18:20:39.939823Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:20:40.058345Z  INFO local_candidate{attempt=60}: eliminated unread FP8 cast input padding clears removed=612
2026-09-12T18:20:40.060860Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:20:40.087370Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:20:40.087403Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:40.089828Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:20:40.089849Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.098749Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:20:40.114039Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:20:40.165460Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:20:40.174737Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:20:40.186668Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:20:40.186689Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.188084Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:20:40.188223Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:20:40.188240Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.197729Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:20:40.201519Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:20:40.201538Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.211129Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:20:40.215746Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:20:40.225180Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:20:40.226685Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:40.226708Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.229626Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:20:40.245331Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:20:40.246364Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:40.246378Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.248171Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:20:40.256187Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:20:40.261233Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:20:40.261250Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.266093Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:20:40.266977Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:20:40.293289Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:20:40.293310Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.319736Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:20:40.429771Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:20:40.443496Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:20:40.443521Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.453747Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:20:40.472417Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:20:40.474600Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:20:40.475316Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:20:40.478570Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:20:40.479575Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:40.479588Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.480323Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:20:40.480338Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.481423Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:20:40.481593Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:20:40.482174Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:20:40.482188Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.486347Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:20:40.489171Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:20:40.489190Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.493166Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:20:40.500264Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:20:40.502406Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:40.502422Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.540884Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:20:40.566462Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:20:40.567041Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:40.567047Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.568491Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:20:40.702063Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:20:40.709936Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:20:40.709962Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.721291Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:20:40.783269Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:20:40.811991Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:40.812017Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.815908Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:20:40.834524Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:20:40.834548Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.843897Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:20:40.846960Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:20:40.847316Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:20:40.860366Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:20:40.860391Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.871112Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:20:40.871158Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:20:40.871738Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:40.871747Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.873133Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:40.888551Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:20:40.890425Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:20:40.890437Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.892640Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:20:40.903085Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:20:40.904245Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:20:40.904266Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.907684Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:20:40.924690Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:20:40.926436Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:20:40.927054Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:40.927066Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.928849Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:20:40.935502Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:20:40.935518Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.937108Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:20:40.938802Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:20:40.944434Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:20:40.952855Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:20:40.953093Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:20:40.963060Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:20:40.975731Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:20:40.977398Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:20:40.977414Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.980368Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:20:40.980718Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:20:40.981286Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:40.981302Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:40.983745Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:20:40.987600Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:20:40.995343Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:20:40.998629Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:20:40.998722Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:20:40.999170Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:40.999182Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.000747Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:20:41.008312Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:20:41.010663Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:20:41.010695Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.015301Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:20:41.017249Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:20:41.018169Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:20:41.024888Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:20:41.026041Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:20:41.026295Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:20:41.026322Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.034940Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:20:41.047616Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:20:41.056234Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:20:41.056779Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:20:41.058559Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:41.058597Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.062334Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:20:41.110126Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:20:41.112438Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:20:41.112455Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.115333Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:20:41.133240Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:20:41.134624Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:20:41.135579Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:20:41.141439Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:20:41.141455Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.148373Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:20:41.154072Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:20:41.155856Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:20:41.155873Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.158135Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:20:41.160387Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:20:41.160408Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.168315Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:20:41.168336Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.168433Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:20:41.168843Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:20:41.168850Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.169874Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:20:41.170963Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:20:41.174674Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:20:41.178820Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:20:41.183942Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:20:41.184325Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:41.184333Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.185400Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:20:41.189868Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:20:41.190451Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:20:41.190466Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.190708Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:20:41.192156Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:20:41.204012Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:20:41.204564Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:20:41.204575Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.206779Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:20:41.227371Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:20:41.232669Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:20:41.233906Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:20:41.233924Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.236060Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:20:41.248963Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:20:41.251226Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:20:41.251242Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.254128Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:20:41.255020Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:20:41.255674Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:41.255684Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.257312Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:41.267482Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:20:41.268013Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:41.268020Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.269388Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:41.284292Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:20:41.292323Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:20:41.292342Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.303192Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:20:41.310036Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:20:41.321990Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:20:41.410061Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:20:41.434492Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:41.434514Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.441284Z  INFO local_candidate{attempt=56}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:20:41.466938Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:20:41.477729Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:20:41.479982Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:20:41.480007Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:41.484269Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:20:41.493654Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:20:41.494937Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:20:41.495314Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:41.495324Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.496768Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:20:41.500698Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:20:41.505896Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:20:41.506244Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:41.506254Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.507155Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:20:41.511751Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:20:41.515859Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:20:41.516971Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:20:41.517516Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:20:41.526806Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:20:41.528755Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:41.528786Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.540033Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:20:41.541238Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:20:41.541755Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:41.541764Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.543542Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:20:41.543657Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:20:41.543683Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:41.559075Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:20:41.559908Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:20:41.578185Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:20:41.578240Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.582858Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:20:41.587372Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:20:41.588897Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:20:41.588920Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.590855Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:20:41.615428Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:20:41.615961Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:20:41.619356Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:20:41.619373Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.620021Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:20:41.621392Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:20:41.621407Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.624145Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:20:41.626281Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:20:41.631194Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:20:41.631606Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:20:41.632833Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:41.632846Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.635041Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:20:41.637949Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:20:41.638316Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:20:41.638325Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.639345Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:20:41.664113Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:20:41.664862Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:20:41.664873Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.666546Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:20:41.675330Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:20:41.684853Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:20:41.710408Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:20:41.719443Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:20:41.719477Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.727934Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:20:41.739574Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:20:41.752053Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:20:41.752581Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:20:41.752592Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.753724Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:20:41.758720Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:20:41.761123Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:20:41.764123Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:20:41.774878Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:20:41.778261Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:20:41.792483Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:20:41.793038Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:41.793048Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.794781Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:20:41.795510Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:41.795532Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.805137Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:20:41.805571Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:41.805581Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.806627Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:20:41.812116Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:20:41.814239Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:20:41.814261Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.817282Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:20:41.818722Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:20:41.819445Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:20:41.830033Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:20:41.843960Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:20:41.844041Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:20:41.862457Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:20:41.865750Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:20:41.867108Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:20:41.867120Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.869896Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:20:41.876900Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:20:41.886446Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:20:41.886464Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.898646Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:20:41.907898Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:20:41.907924Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.910981Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:20:41.915338Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:20:41.915352Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.919760Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:20:41.920339Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:20:41.920622Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:20:41.922910Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:20:41.930413Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:20:41.937568Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:20:41.938223Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:20:41.938237Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.939918Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:20:41.975749Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:20:41.976630Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:20:41.976642Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:41.978129Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:20:41.983308Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:20:42.028535Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:20:42.039019Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:20:42.040826Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:20:42.040843Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.045250Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:20:42.045307Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.051528Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:20:42.056517Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:20:42.056556Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.057291Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:20:42.070133Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:20:42.077612Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:20:42.078300Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:20:42.078316Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.080326Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:20:42.091407Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:20:42.091836Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:42.091845Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.092917Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:20:42.098128Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:20:42.098240Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:20:42.099265Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:42.099278Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.101261Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:20:42.103022Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:20:42.104247Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:20:42.109655Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:20:42.109683Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.110899Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:20:42.119030Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:20:42.122758Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:20:42.123173Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:42.123186Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.124686Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:20:42.138543Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:20:42.139094Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:42.139109Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.140649Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:20:42.148536Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:20:42.152515Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:20:42.153130Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:20:42.153150Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.155321Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:20:42.156687Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:20:42.157364Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:20:42.178434Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:20:42.181598Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:20:42.187366Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:20:42.189665Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:20:42.190727Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:20:42.200823Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:20:42.200847Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.213714Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:20:42.213739Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:20:42.213759Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.217228Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:20:42.226837Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:20:42.227924Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:20:42.227956Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.232419Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:20:42.238693Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:20:42.241147Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:20:42.241652Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:42.241663Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.243367Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:20:42.246191Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:20:42.251024Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:20:42.251050Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.260718Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:20:42.266801Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:20:42.267961Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:42.267974Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.270258Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:20:42.280317Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:20:42.280991Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:20:42.281004Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.282753Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:20:42.299288Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:20:42.301546Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:20:42.301563Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.304596Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:20:42.311677Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:20:42.312949Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:20:42.312967Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.315106Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:20:42.319912Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:20:42.320331Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:20:42.320886Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:42.320894Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.322227Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:42.328167Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:20:42.328474Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:20:42.328488Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.329148Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:20:42.343388Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:20:42.343495Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:20:42.343520Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.353145Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:20:42.362441Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:42.362472Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.375705Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:20:42.376350Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:20:42.376364Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.378603Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:20:42.383367Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:20:42.389361Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:20:42.389761Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:42.389770Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.390859Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:20:42.395844Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:20:42.396661Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:20:42.400000Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:20:42.408092Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:20:42.408431Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:42.408439Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.409355Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:20:42.413998Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:20:42.426129Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:20:42.426579Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:20:42.426589Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.428106Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:20:42.431825Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:20:42.433350Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:20:42.433362Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.436068Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:20:42.442717Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:20:42.485768Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:20:42.495316Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:20:42.507546Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:20:42.515919Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:20:42.515946Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.527427Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:20:42.580597Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:20:42.602667Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:20:42.602700Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.621837Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:20:42.628780Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:20:42.652842Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:20:42.652875Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.671816Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:20:42.672570Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:20:42.674857Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:20:42.674872Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.677664Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:20:42.714294Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:20:42.729804Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:20:42.731463Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:20:42.731492Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.732973Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:20:42.732996Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.736500Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:20:42.739853Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:20:42.750063Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:20:42.761149Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:20:42.761914Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:20:42.761928Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.763926Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:20:42.775535Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:20:42.776016Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:42.776024Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.777184Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:20:42.782856Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:20:42.785191Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:20:42.785224Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.787888Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:20:42.821011Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:20:42.827267Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:20:42.834492Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:20:42.839066Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:20:42.842018Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:20:42.842037Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.853856Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:20:42.854378Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:42.854389Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.855491Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:20:42.859994Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:20:42.860011Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.861062Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:20:42.862581Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:20:42.863356Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:20:42.863373Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.871996Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:20:42.874164Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:20:42.874767Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:20:42.874778Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.876702Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:20:42.879557Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:20:42.886472Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:20:42.889010Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:20:42.899032Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:20:42.899050Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.905909Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:42.905928Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.939906Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:20:42.947144Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:20:42.976523Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:20:42.978225Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:20:42.978238Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:42.981090Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:20:42.988111Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:20:43.028360Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:20:43.030440Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:20:43.032371Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:20:43.034506Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:20:43.034527Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.038289Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:20:43.038358Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.042988Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:20:43.046357Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:20:43.048076Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:20:43.062127Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:20:43.074436Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:20:43.074457Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.081304Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:20:43.087923Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:20:43.100654Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:20:43.101290Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:20:43.101302Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.103229Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:20:43.114060Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:20:43.114490Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:43.114501Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.115535Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:20:43.120806Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:20:43.125645Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:20:43.145155Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:20:43.145181Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.208764Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:20:43.238573Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:43.238596Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.239026Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:20:43.253667Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:20:43.273246Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:20:43.274641Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:20:43.275309Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:43.275318Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.276770Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:43.277605Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:20:43.277621Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.297869Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:20:43.298459Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:43.298468Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.299797Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:20:43.306974Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:20:43.307013Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:20:43.329973Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:20:43.332799Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:20:43.333926Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:20:43.333964Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.345311Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:20:43.363041Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:43.363075Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.365534Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:20:43.367728Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:20:43.367744Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.369466Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:20:43.370156Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:20:43.388752Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:20:43.389230Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:20:43.389251Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.398033Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:20:43.413730Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:20:43.413755Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.435245Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:20:43.436729Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:20:43.436743Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.440080Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:20:43.445840Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:20:43.447370Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:20:43.449797Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:20:43.453535Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:20:43.475105Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:43.475124Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.491711Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:20:43.492745Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:20:43.502511Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:20:43.504791Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:20:43.505177Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:43.505186Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.506582Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:20:43.508641Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:20:43.516166Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:20:43.516532Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:43.516541Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.517428Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:20:43.522389Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:20:43.535030Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:20:43.535563Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:20:43.535579Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.537577Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:20:43.542362Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:20:43.542380Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=4 initial_horizon=496 selected_horizon=496 endpoint_lower_bound=288 lower_bound_gap=208 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:43.543355Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:20:43.545814Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=4 tile=1431 row_words=13 horizon=496
2026-09-12T18:20:43.568549Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=5 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:43.568581Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=5 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:43.569918Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=5 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:43.571927Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:20:43.571948Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.586607Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:20:43.621903Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:20:43.632119Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:20:43.635686Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:20:43.637893Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:20:43.637908Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.640509Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:20:43.736817Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:20:43.759901Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:20:43.759941Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.771271Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:20:43.776780Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:20:43.828016Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:20:43.828043Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.903433Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:20:43.946394Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:20:43.956821Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:20:43.962906Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:20:43.968222Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:20:43.969047Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:43.969066Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.971831Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:20:43.989121Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:20:43.989156Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:43.997165Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:20:43.997224Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:43.999581Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:20:43.999605Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.015288Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:20:44.040696Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:20:44.150925Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:20:44.188115Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:20:44.193503Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:20:44.193524Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.201889Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:20:44.215713Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:20:44.228215Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:20:44.228613Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:20:44.228621Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.229193Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:20:44.229488Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:20:44.230827Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:20:44.230845Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.233890Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:20:44.234257Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:20:44.265042Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:20:44.288648Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:20:44.288672Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.315798Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:20:44.315840Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:44.318868Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:20:44.323185Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:20:44.433175Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:20:44.433232Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:44.456531Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:20:44.491700Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:20:44.529253Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:20:44.529282Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.571894Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:20:44.572183Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:20:44.575319Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:20:44.611098Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:20:44.611130Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.611584Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:20:44.611610Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.611867Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:20:44.613413Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:20:44.613436Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:44.621266Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:20:44.639729Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:20:44.639757Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.639900Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:20:44.646553Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:20:44.666403Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:20:44.686133Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:20:44.686618Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:20:44.729943Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:20:44.729967Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.735012Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:20:44.735033Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.742199Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:20:44.748180Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:20:44.748198Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.755190Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:20:44.765440Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:20:44.767547Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:20:44.776177Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:20:44.776861Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:20:44.776876Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.778241Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:20:44.785671Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:20:44.788402Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:20:44.798234Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:20:44.810126Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:20:44.810774Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:20:44.811155Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:44.811164Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.812749Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:20:44.823187Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:20:44.823637Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:44.823646Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.824786Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:20:44.830110Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:20:44.834900Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:20:44.836254Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:20:44.836928Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:20:44.855365Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:20:44.857947Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:20:44.863225Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:20:44.863243Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.869967Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:20:44.919683Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:20:44.919719Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:44.922838Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:20:44.926942Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:20:44.926958Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.934604Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:20:44.943546Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:20:44.947737Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:20:44.948149Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:20:44.948165Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.949409Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:20:44.960989Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:20:44.961025Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:44.975273Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:20:44.978018Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:20:44.983806Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:20:44.985193Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:20:44.985227Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:44.987788Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:20:44.993397Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:20:44.993416Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.011289Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:20:45.021096Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:20:45.032268Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:20:45.032292Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.049712Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:20:45.097685Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:20:45.097722Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:45.104935Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:20:45.213857Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:20:45.247493Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:20:45.247518Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.260029Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:20:45.291620Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:20:45.309668Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:20:45.309694Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.316049Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:20:45.327640Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:20:45.367793Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:45.367843Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.379400Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:20:45.379443Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.385047Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:20:45.408553Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:20:45.428760Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:20:45.437199Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:20:45.437870Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:45.437878Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.439445Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:20:45.444707Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:20:45.445244Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:45.445255Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.446893Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:20:45.453633Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:20:45.456594Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:20:45.461978Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:20:45.461996Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.469390Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:20:45.479114Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:20:45.490012Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:20:45.490428Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:20:45.490438Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.491285Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:20:45.496021Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:20:45.497709Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:20:45.498608Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:20:45.502108Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:20:45.504541Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:20:45.504554Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.504977Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:20:45.507249Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:20:45.514917Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:20:45.515480Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:45.515492Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.517103Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:20:45.518050Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:20:45.518468Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:45.518477Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.520003Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:20:45.528467Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:20:45.528932Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:45.528940Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.530098Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:20:45.530146Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:20:45.530517Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:45.530528Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.531531Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:20:45.536512Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:20:45.537505Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:20:45.544304Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:20:45.546051Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:20:45.546808Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:20:45.559650Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:20:45.560466Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:20:45.560480Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.562885Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:20:45.570091Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:20:45.575472Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:20:45.584448Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:20:45.584468Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.591801Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:20:45.594964Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:20:45.614774Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:20:45.615560Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:20:45.615573Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.617736Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:20:45.630006Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:20:45.630506Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:45.630522Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.631733Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:20:45.637498Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:20:45.639602Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:20:45.642411Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:20:45.643591Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:20:45.643604Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.643693Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:20:45.650347Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:20:45.651099Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:20:45.657139Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:20:45.657159Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.662788Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:20:45.663179Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:20:45.663187Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.664347Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:20:45.664631Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:20:45.665067Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:45.665074Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.666704Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:20:45.677552Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:20:45.677971Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:45.677979Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.679066Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:20:45.684536Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:20:45.689472Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:20:45.690295Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:20:45.690855Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:20:45.691080Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:20:45.691090Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.691531Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:20:45.692556Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:20:45.713851Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:20:45.717258Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:20:45.784359Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:20:45.791223Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:20:45.791258Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.801324Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:20:45.814652Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:20:45.815083Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:20:45.815092Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.816345Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:20:45.842180Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:20:45.843049Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:20:45.843061Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.844787Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:20:45.907941Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:20:45.929603Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:20:45.929631Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:45.943391Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:20:46.061991Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:20:46.070409Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:20:46.093620Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:46.093644Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.097077Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:20:46.097095Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.123846Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:20:46.135920Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:20:46.161591Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:20:46.162249Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:46.162258Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.163816Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:20:46.166645Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:20:46.181914Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:20:46.195989Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:46.196013Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.231032Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:20:46.233414Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:20:46.233429Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.236349Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:20:46.239225Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:20:46.240741Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:20:46.240771Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.262199Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:20:46.262718Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:46.262725Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.264024Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:20:46.278192Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:20:46.283507Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:20:46.283526Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.290511Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:20:46.309708Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:20:46.317642Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:20:46.319984Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:20:46.320001Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.322674Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:20:46.353375Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:20:46.368518Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:20:46.368992Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:46.369001Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.370535Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:20:46.371121Z  INFO local_candidate{attempt=58}: compared ordinary and paired exchange schedules phase=34 candidates=6561 ordinary_horizon=8541 paired_horizon=6920 use_paired=false
2026-09-12T18:20:46.382077Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:20:46.382550Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:46.382565Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.383582Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:20:46.389271Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:20:46.408540Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:20:46.409416Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:20:46.409430Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.411622Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:20:46.414828Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:20:46.427753Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:20:46.427798Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:46.431391Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:20:46.431427Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.440653Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:20:46.449992Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:20:46.461415Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:20:46.462011Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:20:46.462019Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.464227Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:20:46.475242Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:20:46.475643Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:46.475650Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.476734Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:20:46.481814Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:20:46.486151Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:20:46.500309Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:20:46.500552Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:20:46.502488Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:20:46.502503Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.505359Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:20:46.536449Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:20:46.536473Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.556998Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:20:46.570257Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:20:46.570284Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.572921Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:20:46.577875Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:20:46.602472Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:20:46.603697Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:20:46.603732Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.607049Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:20:46.623815Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:20:46.625976Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:20:46.626716Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:46.626734Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.628544Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:20:46.637402Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:20:46.644901Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:20:46.644919Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.644983Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:20:46.661683Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:20:46.731711Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:20:46.752980Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:20:46.753013Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.765733Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:20:46.926392Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:20:46.938108Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:20:46.938147Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:46.959610Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:20:47.172426Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:20:47.197751Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:20:47.197802Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:47.234241Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:20:47.266518Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:20:47.282019Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:20:47.282056Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:47.284659Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:20:47.292491Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:20:47.294113Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:20:47.315853Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:20:47.315879Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:47.323828Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:20:47.323853Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:47.326425Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:20:47.327778Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:20:47.327798Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:47.330392Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:20:47.341333Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:20:47.341363Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:47.342120Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:20:47.378580Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:20:47.380162Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:20:47.385234Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:20:47.385263Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:47.417055Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:20:47.434808Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:20:47.434843Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:47.459581Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:20:47.492585Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:20:47.501316Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:20:47.501356Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:47.510431Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:20:47.541633Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:20:47.541667Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:47.549851Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:20:47.554694Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:20:47.560801Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:20:47.560822Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:47.568455Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:20:47.579156Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:20:47.590298Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:20:47.590729Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:20:47.590737Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:47.591649Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:20:47.596821Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:20:47.609732Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:20:47.609767Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:47.630539Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:20:47.641863Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:20:47.641917Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:47.652817Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:20:47.909380Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:20:47.909434Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:47.957682Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:20:47.959396Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:20:47.994458Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:20:47.994481Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:48.029521Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:20:48.119701Z  INFO local_candidate{attempt=61}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:20:48.150061Z  INFO local_candidate{attempt=58}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5611 paired_horizon=11247 use_paired=false
2026-09-12T18:20:48.207944Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:20:48.222263Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:20:48.222298Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=18 initial_horizon=5611 selected_horizon=5611 endpoint_lower_bound=4656 lower_bound_gap=955 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:48.244631Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:20:48.244660Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:48.250674Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=18 tile=109 row_words=345 horizon=5611
2026-09-12T18:20:48.266196Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:20:48.266249Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:48.289844Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:20:48.334751Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:20:48.392687Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:20:48.404295Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:20:48.404330Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:48.423462Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:20:48.469078Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:20:48.477322Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:20:48.477366Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:48.488758Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:20:48.505317Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:20:48.520067Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:20:48.520754Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:20:48.520775Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:48.522300Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:20:48.530026Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:20:48.720814Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:20:48.747076Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:20:48.747106Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:48.755008Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:20:48.777007Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:20:48.798155Z  INFO local_candidate{attempt=55}: compared ordinary and paired exchange schedules phase=22 candidates=18 ordinary_horizon=2545 paired_horizon=2362 use_paired=false
2026-09-12T18:20:48.809042Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:20:48.809065Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:48.813330Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:20:48.817317Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:20:48.817336Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:48.926824Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:20:48.984452Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:20:48.984487Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:49.002235Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:20:49.018795Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:20:49.045114Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:20:49.078775Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:20:49.078810Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.115928Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:20:49.118274Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:20:49.118302Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.197346Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:20:49.247924Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:20:49.247949Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.252344Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:20:49.270397Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:20:49.293460Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:20:49.294945Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:20:49.294971Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.318590Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:20:49.318625Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.321803Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:20:49.335144Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:20:49.335292Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:20:49.351809Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:20:49.358176Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:20:49.359905Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:20:49.359932Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.362676Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:20:49.364245Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:20:49.371765Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:20:49.372773Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:20:49.372786Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.374954Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:20:49.378529Z  INFO local_candidate{attempt=56}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:20:49.379378Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:20:49.379863Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:20:49.379871Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.381513Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:20:49.392159Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:20:49.392585Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:49.392597Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.393672Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:20:49.399224Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:20:49.412954Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:20:49.413614Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:20:49.413626Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.415347Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:20:49.420648Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:20:49.420677Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.432775Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:20:49.444459Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:20:49.444480Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.461061Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:20:49.468932Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:20:49.507893Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:49.507930Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.518018Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:49.518053Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:49.529909Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:20:49.529941Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:49.540250Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:20:49.540283Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:49.546041Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:20:49.552950Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:20:49.570192Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:20:49.570780Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:49.570788Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.572259Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:20:49.593342Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:20:49.593631Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:20:49.602930Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:20:49.647169Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:20:49.648851Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:20:49.648878Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:49.653139Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:20:49.815851Z  INFO local_candidate{attempt=55}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:20:49.855062Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:20:49.856025Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:20:49.856053Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:49.867854Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:20:49.904305Z  INFO local_candidate{attempt=55}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:20:49.925752Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:20:49.925784Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:50.026436Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:20:50.026466Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:50.032885Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:20:50.073388Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:20:50.192257Z  INFO local_candidate{attempt=57}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:20:50.314085Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:20:50.314115Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:50.360549Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:20:50.387872Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:20:50.415779Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:20:50.415808Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:50.445186Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:20:50.477933Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:20:50.507185Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:50.507226Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:50.516956Z  INFO local_candidate{attempt=56}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:20:50.543351Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:20:50.546551Z  INFO local_candidate{attempt=56}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:20:50.546575Z  INFO local_candidate{attempt=56}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:50.567965Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:20:50.568589Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:50.568599Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:50.570047Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:20:50.579171Z  INFO local_candidate{attempt=56}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:20:50.585978Z  INFO local_candidate{attempt=59}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:20:50.635360Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:20:50.637576Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:20:50.637593Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:50.640161Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:20:50.685152Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:20:50.709926Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:20:50.709952Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:50.710038Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:20:50.710061Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:50.740007Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:20:50.756270Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:20:51.072936Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:20:51.076269Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:20:51.100943Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:20:51.100967Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.111015Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:20:51.111039Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.129561Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:20:51.156128Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:20:51.239599Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:20:51.241435Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:20:51.241466Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.277286Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:20:51.281463Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:20:51.281492Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.300253Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:20:51.319143Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:20:51.319844Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:51.319855Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.321367Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:20:51.326666Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:20:51.327316Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:20:51.332030Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:20:51.335652Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:20:51.335679Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.346887Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:20:51.362284Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:20:51.366699Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:20:51.366729Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.369914Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:20:51.369941Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.373275Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:20:51.373706Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:20:51.373714Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.374622Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:20:51.379553Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:20:51.389433Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:20:51.389456Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.435078Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:20:51.435101Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.437670Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:20:51.442238Z  INFO local_candidate{attempt=62}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:20:51.458977Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:20:51.465744Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:20:51.483475Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:20:51.502486Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:20:51.502519Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.510277Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:20:51.510308Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.511503Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:20:51.534338Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:20:51.554773Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:20:51.558835Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:20:51.558870Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.571697Z  INFO local_candidate{attempt=57}: compared ordinary and paired exchange schedules phase=23 candidates=2187 ordinary_horizon=16242 paired_horizon=11597 use_paired=false
2026-09-12T18:20:51.575484Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:20:51.575525Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.588068Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:20:51.589818Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:20:51.589837Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.590199Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:20:51.594143Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:20:51.609503Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:20:51.609528Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.611094Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:20:51.620172Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:20:51.748598Z  INFO local_candidate{attempt=58}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:20:51.762079Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:20:51.762118Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.765806Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:20:51.765836Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=24 initial_horizon=10556 selected_horizon=10556 endpoint_lower_bound=7680 lower_bound_gap=2876 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.768366Z  INFO local_candidate{attempt=60}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=17260 paired_horizon=25623 use_paired=false
2026-09-12T18:20:51.780849Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:20:51.792732Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=24 tile=535 row_words=149 horizon=10556
2026-09-12T18:20:51.834589Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:20:51.860326Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:20:51.860359Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.868719Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:20:51.868746Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.875720Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:20:51.890665Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:20:51.890695Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=8 initial_horizon=17260 selected_horizon=17260 endpoint_lower_bound=9856 lower_bound_gap=7404 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.906540Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-12T18:20:51.906568Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.908959Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:20:51.911907Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:20:51.913785Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:20:51.921440Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:20:51.931834Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:20:51.937174Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=8 tile=104 row_words=649 horizon=17260
2026-09-12T18:20:51.946805Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:20:51.946821Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:51.951079Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:20:51.951107Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:51.963105Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:20:51.976991Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:20:52.001429Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:20:52.001454Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:52.018638Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:20:52.018662Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:52.169990Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:20:52.196694Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:20:52.220836Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:20:52.222222Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:20:52.223316Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:20:52.223331Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:52.226382Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:20:52.245107Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:20:52.245127Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:52.252780Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:20:52.253856Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:20:52.253870Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:52.256640Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:20:52.273727Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:20:52.286394Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:20:52.306134Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:20:52.306182Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=24 initial_horizon=10153 selected_horizon=10153 endpoint_lower_bound=7680 lower_bound_gap=2473 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:52.319512Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:20:52.319559Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:52.339610Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=24 tile=885 row_words=146 horizon=10153
2026-09-12T18:20:52.349807Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:20:52.492968Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:20:52.493002Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=25 initial_horizon=14502 selected_horizon=14502 endpoint_lower_bound=7872 lower_bound_gap=6630 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:52.501357Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=14502
2026-09-12T18:20:52.621067Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:20:52.692873Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:20:52.692904Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:52.753080Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:20:52.754301Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:20:52.788653Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:20:52.788675Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:52.798308Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:20:52.837448Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:20:52.869052Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:20:52.871412Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:20:52.871436Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:52.903403Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:20:52.903435Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:52.935277Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:20:52.966111Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:20:52.993870Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:20:53.010703Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:20:53.011537Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:20:53.011549Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.013652Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:20:53.068753Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:20:53.068785Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.129467Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:20:53.185129Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:20:53.204595Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:20:53.259011Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:20:53.259048Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.280148Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:20:53.280186Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.339432Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:20:53.339470Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:53.353668Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:20:53.359730Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:20:53.374583Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:20:53.409254Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:20:53.410773Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:20:53.410799Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.414053Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:20:53.435684Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:20:53.438759Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:20:53.439643Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:20:53.439657Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.441779Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:20:53.500686Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:20:53.500716Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.593785Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:20:53.606066Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:20:53.644136Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:20:53.644179Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:53.670511Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:20:53.670546Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.675496Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:20:53.707171Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:53.707219Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:53.708026Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:20:53.744009Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:20:53.744048Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.777045Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:20:53.777593Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:20:53.799666Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:20:53.813450Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:20:53.814615Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:20:53.814630Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.817957Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:20:53.824296Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:20:53.824325Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=13 initial_horizon=12868 selected_horizon=12868 endpoint_lower_bound=11940 lower_bound_gap=928 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:53.833218Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:20:53.834080Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:20:53.834092Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.836423Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:20:53.850965Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:20:53.875892Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-12T18:20:53.877351Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:20:53.877371Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:53.917188Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:20:54.193967Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:20:54.223517Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:20:54.274350Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:20:54.274388Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:54.288435Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:20:54.288477Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:54.290596Z  INFO local_candidate{attempt=62}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:20:54.309344Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:20:54.332828Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:20:54.332854Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:54.375729Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:20:54.440734Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:20:54.512855Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:20:54.512908Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:54.528699Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:20:54.760748Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:20:54.786486Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:20:54.795896Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:20:54.803416Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:20:54.803696Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:54.812602Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:20:54.812625Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:54.844721Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:20:54.851187Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:20:54.869659Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:20:54.869690Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:54.962859Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:20:54.963601Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:20:55.007248Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:20:55.007281Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:55.015184Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:20:55.016026Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:20:55.016039Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:55.018074Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:20:55.032083Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:20:55.041793Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:20:55.041824Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:55.047136Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:20:55.054601Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:20:55.084913Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:20:55.090858Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:20:55.090889Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:55.099196Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:20:55.099243Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:55.121271Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:20:55.121295Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:55.129314Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:20:55.146143Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:20:55.163576Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:20:55.163614Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:55.168627Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:20:55.208220Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:20:55.208261Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:55.211409Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=27 tile=1452 row_words=15 horizon=3578
2026-09-12T18:20:55.260309Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:20:55.306434Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:20:55.306479Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=29 initial_horizon=9150 selected_horizon=9150 endpoint_lower_bound=5120 lower_bound_gap=4030 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:55.320772Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:20:55.325113Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=29 tile=452 row_words=54 horizon=9150
2026-09-12T18:20:55.385524Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:20:55.385550Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:55.489328Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:20:55.603402Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:20:55.603462Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:55.616348Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:20:55.622183Z  INFO local_candidate{attempt=61}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:20:55.647920Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:20:55.651235Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:20:55.651260Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:55.682617Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:20:55.689520Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:20:55.689553Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:55.757254Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:20:55.757295Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:55.780659Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:20:55.853472Z  INFO local_candidate{attempt=61}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:55.853511Z  INFO local_candidate{attempt=61}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:55.906573Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:20:55.916169Z  INFO local_candidate{attempt=55}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:20:55.932748Z  INFO local_candidate{attempt=61}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:20:55.968458Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:20:55.968492Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:55.997689Z  INFO local_candidate{attempt=55}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:20:55.997739Z  INFO local_candidate{attempt=55}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:56.007555Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:20:56.038602Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:20:56.038638Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=14 initial_horizon=7135 selected_horizon=7135 endpoint_lower_bound=3240 lower_bound_gap=3895 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:56.049901Z  INFO local_candidate{attempt=55}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:20:56.069802Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=14 tile=964 row_words=285 horizon=7135
2026-09-12T18:20:56.101400Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:20:56.105253Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:56.105284Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:56.128701Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:20:56.128738Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:56.165018Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:20:56.177575Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:20:56.190529Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:20:56.242151Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:20:56.242177Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:56.308282Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:20:56.361807Z  INFO local_candidate{attempt=62}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:56.361842Z  INFO local_candidate{attempt=62}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:56.374259Z  INFO local_candidate{attempt=60}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:20:56.388573Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:20:56.407282Z  INFO local_candidate{attempt=60}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:20:56.407309Z  INFO local_candidate{attempt=60}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:56.427263Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:20:56.427298Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:56.447082Z  INFO local_candidate{attempt=62}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:20:56.451972Z  INFO local_candidate{attempt=60}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:20:56.461799Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:20:56.608182Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:20:56.648301Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:20:56.648329Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:56.678545Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:20:56.992283Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:20:56.992330Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:57.012148Z  INFO local_candidate{attempt=58}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:20:57.033221Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:20:57.076541Z  INFO local_candidate{attempt=59}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:20:57.105663Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:20:57.105700Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:57.144897Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:20:57.144924Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:57.193525Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:20:57.239309Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=26 success=true
2026-09-12T18:20:57.242196Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:20:57.248000Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:20:57.263730Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:20:57.305795Z  INFO local_candidate{attempt=57}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:20:57.377495Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:20:57.377533Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:57.423235Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:20:57.523811Z  INFO local_candidate{attempt=57}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:57.523854Z  INFO local_candidate{attempt=57}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:57.591131Z  INFO local_candidate{attempt=61}: exchange table and repeat patch storage exchange_table_bytes=28132 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:20:57.606240Z  INFO local_candidate{attempt=57}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:20:58.301237Z  INFO local_candidate{attempt=59}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:58.301275Z  INFO local_candidate{attempt=59}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:58.371387Z  INFO local_candidate{attempt=59}: finished large physical exchange phase phase=30 tile=472 row_words=443 horizon=14541
2026-09-12T18:20:58.431115Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=29 success=true
2026-09-12T18:20:58.434066Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:20:58.439792Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:20:58.717066Z  INFO local_candidate{attempt=58}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:20:58.717102Z  INFO local_candidate{attempt=58}: optimized physical exchange schedule phase=30 initial_horizon=14541 selected_horizon=14541 endpoint_lower_bound=9072 lower_bound_gap=5469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:20:58.775178Z  INFO local_candidate{attempt=59}: exchange table and repeat patch storage exchange_table_bytes=28132 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:20:58.798116Z  INFO local_candidate{attempt=58}: finished large physical exchange phase phase=30 tile=707 row_words=441 horizon=14541
2026-09-12T18:20:58.860465Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=31 success=true
2026-09-12T18:20:58.864816Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=4 success=true
2026-09-12T18:20:58.865428Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=35 success=true
2026-09-12T18:20:58.869167Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=38 success=true
2026-09-12T18:20:58.869299Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:20:58.872291Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:20:58.872370Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=3 success=true
2026-09-12T18:20:58.874376Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=43 success=true
2026-09-12T18:20:58.875127Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:20:58.876313Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=42 success=true
2026-09-12T18:20:58.877329Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:20:58.879343Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:20:58.879713Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="plan_kernels"}: package build phase finished phase="plan_kernels" elapsed_ms=48 success=true
2026-09-12T18:20:58.880975Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:20:58.882458Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="compile_kernels"}: package build phase finished phase="compile_kernels" elapsed_ms=2 success=true
2026-09-12T18:20:58.883328Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:20:58.886326Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:20:58.891698Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="link_runtime"}: package build phase finished phase="link_runtime" elapsed_ms=0 success=true
2026-09-12T18:20:59.214538Z  INFO local_candidate{attempt=60}: exchange table and repeat patch storage exchange_table_bytes=28132 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:20:59.218179Z  INFO local_candidate{attempt=55}: exchange table and repeat patch storage exchange_table_bytes=27544 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:20:59.220560Z  INFO local_candidate{attempt=56}: exchange table and repeat patch storage exchange_table_bytes=27544 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:20:59.222441Z  INFO local_candidate{attempt=57}: exchange table and repeat patch storage exchange_table_bytes=27544 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:20:59.225009Z  INFO local_candidate{attempt=62}: exchange table and repeat patch storage exchange_table_bytes=28132 maximum_uncompressed_repeat_patch_bytes=1296 maximum_elided_arithmetic_patch_bytes=1296
2026-09-12T18:20:59.281401Z  INFO local_candidate{attempt=58}: exchange table and repeat patch storage exchange_table_bytes=28100 maximum_uncompressed_repeat_patch_bytes=1188 maximum_elided_arithmetic_patch_bytes=1188
2026-09-12T18:20:59.520815Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=61 success=true
2026-09-12T18:20:59.520862Z  INFO local_candidate{attempt=61}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=9968 exchange_table_bytes=28132 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:20:59.520878Z  INFO local_candidate{attempt=61}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=28132 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9968 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:20:59.966729Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=445 success=true
2026-09-12T18:20:59.975612Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:20:59.984838Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:20:59.992308Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:20:59.992537Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:20:59.993119Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:20:59.993128Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:59.994053Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:20:59.994485Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:20:59.994557Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:20:59.994763Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:20:59.995183Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:20:59.995196Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:20:59.996008Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:20:59.996885Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:21:00.004829Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:21:00.014392Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:21:00.014993Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:00.015006Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.017492Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:21:00.017755Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:21:00.024926Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:21:00.025780Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:21:00.025794Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.027465Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:21:00.028655Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:21:00.030401Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:21:00.030419Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.033318Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:21:00.033891Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:00.033902Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.035380Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:21:00.035489Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:21:00.035653Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:21:00.040844Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:21:00.045055Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:21:00.048149Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:21:00.064019Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:21:00.068335Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:21:00.068908Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:21:00.068919Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.070308Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:21:00.114497Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:21:00.115363Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:21:00.118918Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:21:00.118937Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.120045Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:21:00.120064Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.122633Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:21:00.130055Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:21:00.138462Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:21:00.138952Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:21:00.138962Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.140423Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:21:00.170910Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:21:00.172289Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:21:00.172315Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.174983Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:21:00.196839Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:21:00.202329Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:21:00.202349Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.207178Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:21:00.209470Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:21:00.214724Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:21:00.214744Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.220223Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:21:00.222963Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:21:00.246739Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:21:00.266797Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:21:00.266819Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.275464Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:21:00.277884Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:21:00.277901Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.280154Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:21:00.280859Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:21:00.297105Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:21:00.297610Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:00.297620Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.298791Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:21:00.304419Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:21:00.308896Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:21:00.343492Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:21:00.362896Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:21:00.363598Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:00.363619Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.366676Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:21:00.368916Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:21:00.368936Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.385727Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:21:00.386999Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:21:00.387018Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.390563Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:21:00.395173Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:21:00.686073Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:21:00.686120Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:00.692447Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:21:00.711352Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:21:00.712028Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:21:00.717147Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:21:00.717167Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.733254Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:21:00.742330Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:21:00.747195Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:21:00.747232Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.751611Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:21:00.758020Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:21:00.758039Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.764726Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:21:00.764744Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.772636Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:21:00.773887Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:21:00.791405Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:21:00.796763Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:21:00.797711Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:00.797724Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.799471Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:21:00.801829Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:21:00.826731Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:21:00.826767Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.842330Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:21:00.844320Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:21:00.844349Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:00.849180Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:21:00.863120Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:21:00.863152Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:00.866720Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:21:00.871276Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:21:01.044741Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:21:01.045183Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:01.045193Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:01.047169Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:21:01.049651Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:21:01.063668Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:21:01.065427Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:21:01.065439Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:01.066973Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:21:01.165881Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:21:01.171045Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:21:01.185377Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:21:01.185406Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:01.197651Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:21:01.202305Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:01.202339Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:01.244137Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:21:01.261862Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:21:01.261904Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:01.282411Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:21:01.309418Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:21:01.332408Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:21:01.332437Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:01.350453Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:21:01.353603Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:21:01.383859Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:01.383939Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:01.423592Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:21:01.536820Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:21:01.572767Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:21:01.572802Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:01.613319Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:21:01.703213Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=545 success=true
2026-09-12T18:21:01.703264Z  INFO local_candidate{attempt=57}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=10048 exchange_table_bytes=27544 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:21:01.703261Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=586 success=true
2026-09-12T18:21:01.703274Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=488 success=true
2026-09-12T18:21:01.703298Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=526 success=true
2026-09-12T18:21:01.703313Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=519 success=true
2026-09-12T18:21:01.703280Z  INFO local_candidate{attempt=57}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=27544 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10048 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:21:01.703337Z  INFO local_candidate{attempt=58}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=9968 exchange_table_bytes=28100 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:21:01.703293Z  INFO local_candidate{attempt=60}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=9968 exchange_table_bytes=28132 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:21:01.703355Z  INFO local_candidate{attempt=58}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=28100 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9968 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:21:01.703325Z  INFO local_candidate{attempt=55}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=10048 exchange_table_bytes=27544 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:21:01.703362Z  INFO local_candidate{attempt=60}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=28132 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9968 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:21:01.703309Z  INFO local_candidate{attempt=62}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=9968 exchange_table_bytes=28132 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:21:01.703371Z  INFO local_candidate{attempt=55}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=27544 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10048 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:21:01.703377Z  INFO local_candidate{attempt=62}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=28132 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9968 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:21:01.703704Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=401 success=true
2026-09-12T18:21:01.703729Z  INFO local_candidate{attempt=56}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=10048 exchange_table_bytes=27544 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:21:01.703741Z  INFO local_candidate{attempt=56}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=27544 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=10048 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:21:01.734704Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:21:01.755662Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:21:01.755687Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:01.791384Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:21:02.230079Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:21:02.232410Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:21:02.243592Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:21:02.268273Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:21:02.268296Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.272355Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:21:02.272378Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.279451Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:21:02.279472Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.305696Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:21:02.306157Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:21:02.337116Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:21:02.431431Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=728 success=true
2026-09-12T18:21:02.432860Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=729 success=true
2026-09-12T18:21:02.434965Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=731 success=true
2026-09-12T18:21:02.435849Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=732 success=true
2026-09-12T18:21:02.436156Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:21:02.441237Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=737 success=true
2026-09-12T18:21:02.443518Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=740 success=true
2026-09-12T18:21:02.445465Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:21:02.446075Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:02.446086Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.447256Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:21:02.447393Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:21:02.450820Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:21:02.451658Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:02.451673Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.453615Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:21:02.453677Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:21:02.457355Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:21:02.458729Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=2773 maximum_identical_destinations=1
2026-09-12T18:21:02.458743Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=496 selected_horizon=496 endpoint_lower_bound=288 lower_bound_gap=208 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.461447Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=1431 row_words=13 horizon=496
2026-09-12T18:21:02.466146Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:21:02.466833Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:02.466849Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.468168Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:21:02.468832Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:21:02.468853Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.469565Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:21:02.470779Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:21:02.475229Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:21:02.475785Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=5 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:02.475795Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=5 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.477452Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=5 tile=13 row_words=21 horizon=2978
2026-09-12T18:21:02.484810Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:21:02.485375Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:02.485391Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.487032Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:21:02.495082Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:21:02.501741Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:21:02.503034Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:21:02.503743Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:21:02.504587Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:21:02.514882Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:21:02.522252Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:21:02.542297Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:21:02.542842Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:21:02.542883Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:21:02.542894Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.544075Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:21:02.544939Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:21:02.545446Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:02.545457Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.546839Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:21:02.549307Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:21:02.555684Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:21:02.558000Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:21:02.564970Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:21:02.576679Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:21:02.577122Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:02.577131Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.578778Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:21:02.588180Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:21:02.588583Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:02.588594Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.588829Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:21:02.589534Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:21:02.594361Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:21:02.598739Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:21:02.599978Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:21:02.600583Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:21:02.623752Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:21:02.639929Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:21:02.645691Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:21:02.645715Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.656387Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:21:02.671505Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:21:02.676500Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:21:02.677102Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:21:02.677121Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.678993Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:21:02.679939Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:21:02.679968Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.690811Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:21:02.693872Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:21:02.697877Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:21:02.697894Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.704355Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:21:02.710931Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:21:02.711522Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:02.711538Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.713159Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:21:02.716224Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:21:02.716658Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:21:02.716666Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.717641Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:21:02.717693Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:21:02.719921Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:21:02.721196Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:21:02.721231Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.721341Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:21:02.723711Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:21:02.738061Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:21:02.742571Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:21:02.743326Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:21:02.743501Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:21:02.743515Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.744238Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:21:02.744255Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.745642Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:21:02.746428Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:21:02.779104Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:21:02.779141Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.800066Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:21:02.805194Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:21:02.805234Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.812365Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:21:02.812391Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.833796Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:21:02.853092Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:21:02.894219Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:21:02.908731Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:21:02.909570Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:21:02.910007Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:02.910017Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.911601Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:21:02.923290Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:21:02.923754Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:02.923763Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.924943Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:21:02.930497Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:21:02.935139Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:21:02.946622Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:21:02.947184Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:02.947192Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:02.948562Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:21:02.996268Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:21:03.012187Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:21:03.012259Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:03.028542Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:21:03.048770Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:21:03.063230Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:21:03.063263Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.099148Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:21:03.127344Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:21:03.153401Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:21:03.153427Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.174085Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:21:03.185635Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:21:03.187356Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:21:03.187377Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.189607Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:21:03.197233Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:21:03.198184Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:21:03.203826Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:21:03.203863Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.214445Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:21:03.214524Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.219108Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:21:03.229665Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:21:03.230657Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:21:03.231402Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:21:03.232416Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:03.232428Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.234161Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:21:03.236027Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:21:03.241883Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:21:03.242940Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:21:03.242959Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.247343Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:21:03.248379Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:03.248394Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.249325Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:21:03.249343Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.250168Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:21:03.253282Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:21:03.256723Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:21:03.256748Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.257697Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:21:03.258749Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:03.258764Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.259476Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:21:03.260521Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:21:03.267905Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:21:03.280075Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:21:03.280987Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:21:03.281154Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:03.281169Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.283356Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:21:03.284946Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:21:03.286011Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:03.286024Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.286472Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:21:03.286490Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2904 selected_horizon=2904 endpoint_lower_bound=2304 lower_bound_gap=600 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.287854Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:21:03.291624Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=21 row_words=157 horizon=2904
2026-09-12T18:21:03.295527Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:21:03.296572Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:03.296585Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.298333Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:21:03.363021Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:21:03.439670Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:21:03.439705Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.450232Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:21:03.457964Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:21:03.457989Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.470001Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:21:03.470070Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:21:03.473502Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:21:03.477467Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:21:03.477484Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.485305Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:21:03.485733Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:21:03.485750Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.488644Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:21:03.494309Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:21:03.502505Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="size_tile_code"}: package build phase finished phase="size_tile_code" elapsed_ms=2821 success=true
2026-09-12T18:21:03.502529Z  INFO local_candidate{attempt=59}: placing generated tile programs linked_end=385012 host_code_base=385016 host_code_bytes=8892 generated_code_bytes=9968 exchange_table_bytes=28132 executable_ranges=[(377220, 377224), (378228, 378232), (380284, 380288), (382020, 382024), (384036, 384040), (385012, 385016), (393976, 524288)]
2026-09-12T18:21:03.502542Z  INFO local_candidate{attempt=59}: allocated package support memory linked_end=385012 profile_bytes=0 exchange_table_bytes=28132 host_code_bytes=8892 host_data_bytes=6148 generated_code_bytes=9968 code_address=393976 available_ranges=[(327680, 360448), (368356, 376832), (442368, 949168)]
2026-09-12T18:21:03.509832Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:21:03.513380Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:21:03.514010Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:21:03.514020Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.515863Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:21:03.516091Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:21:03.517826Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:21:03.517844Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.525411Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:21:03.525565Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:21:03.525586Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.526445Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:21:03.526884Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:03.526897Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.527916Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:21:03.529675Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:21:03.533069Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:21:03.534864Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:21:03.534888Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.537484Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:21:03.538755Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:21:03.546469Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:21:03.554946Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:21:03.555831Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2338 maximum_identical_destinations=1
2026-09-12T18:21:03.555844Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.557800Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:21:03.574157Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:21:03.587332Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:21:03.587355Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.593952Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:21:03.594416Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:21:03.615800Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:21:03.616833Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:21:03.616858Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.620234Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:21:03.621718Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:21:03.621752Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.637876Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:21:03.638369Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:03.638379Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.639704Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:21:03.667668Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:21:03.686229Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:21:03.689481Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:21:03.716672Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:21:03.716696Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.742188Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:21:03.772433Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:21:03.791784Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:21:03.791813Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.805061Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:21:03.858349Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:21:03.860390Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:21:03.860408Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.863189Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:21:03.909009Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:21:03.915545Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:21:03.915577Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:03.921738Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:21:03.947547Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:21:03.963054Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:21:03.975479Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:21:03.999462Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:21:03.999489Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=8541 selected_horizon=8541 endpoint_lower_bound=5248 lower_bound_gap=3293 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.005489Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:04.005520Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.009079Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:21:04.009100Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.014656Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=268 horizon=8541
2026-09-12T18:21:04.061556Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:21:04.090052Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:21:04.093238Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:21:04.093261Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.098169Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:21:04.106802Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:21:04.143046Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:21:04.156647Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:21:04.158227Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:21:04.158243Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.161180Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:21:04.163816Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:21:04.163833Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.168944Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:21:04.190273Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:21:04.216255Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:21:04.226956Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:21:04.262224Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:21:04.292244Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:21:04.292299Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.315712Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:21:04.365923Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:21:04.368197Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:21:04.368229Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.370927Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:21:04.377759Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:21:04.378888Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:04.378906Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.381568Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:21:04.429815Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:21:04.449501Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:21:04.454533Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:04.454557Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.480234Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:21:04.487663Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:21:04.506635Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:04.506660Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.522005Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:21:04.523368Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:21:04.523382Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.526051Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:21:04.528936Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:21:04.532835Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:21:04.540016Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:21:04.554886Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:04.554909Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.571445Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:21:04.578746Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:21:04.579804Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:21:04.580985Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:21:04.581016Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.585652Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:21:04.593097Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:21:04.595258Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:21:04.596661Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:21:04.604721Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:04.604745Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.624587Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:21:04.629474Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:21:04.630808Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:21:04.630821Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.633593Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:21:04.639341Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:21:04.640494Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:21:04.652008Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:04.652040Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.663663Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:21:04.673995Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:21:04.675308Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:21:04.675321Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.675895Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:21:04.677998Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:21:04.684914Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:21:04.688129Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:21:04.690559Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:21:04.699485Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:21:04.700171Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:21:04.706104Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:21:04.717119Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:21:04.717511Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:04.717521Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.718912Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:21:04.728000Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:21:04.728064Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:21:04.728361Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:04.728372Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.729256Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:21:04.734102Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:21:04.740254Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:21:04.740887Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:21:04.741933Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:21:04.742692Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:21:04.758739Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:21:04.771280Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:21:04.778754Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:21:04.778785Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.803108Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:21:04.832062Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:21:04.836056Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:21:04.836075Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.837332Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:21:04.837364Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:04.839199Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:21:04.842431Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:21:04.854115Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:21:04.854573Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:21:04.854592Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.856191Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:21:04.881856Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:21:04.887461Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:21:04.888747Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:21:04.888769Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.891139Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:21:04.913938Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:21:04.913969Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.926371Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:21:04.928098Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:21:04.941850Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:21:04.942045Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:21:04.944522Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:21:04.947495Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:21:04.947515Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.949300Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:21:04.949328Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.952060Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:21:04.971309Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:21:04.971343Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.976305Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:21:04.976332Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.979289Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:21:04.991321Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:21:04.992995Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:21:04.993467Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:04.993484Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:04.995069Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:21:04.997725Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:21:05.004025Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:21:05.008152Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:21:05.015821Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:21:05.016244Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:05.016254Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.017814Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:21:05.031665Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:21:05.032316Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:05.032371Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.034066Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:21:05.034563Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:21:05.034635Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.042159Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:21:05.042597Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:21:05.049571Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:21:05.051478Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:21:05.052376Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:21:05.057489Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:21:05.058575Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:21:05.059652Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:21:05.059668Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.062051Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:21:05.067467Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:21:05.089703Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:21:05.095153Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:21:05.100561Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:21:05.100583Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.106452Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:21:05.111656Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:21:05.111686Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.116725Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:21:05.164188Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:21:05.171070Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:21:05.171108Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.180775Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:21:05.188143Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:21:05.194521Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:21:05.194985Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:21:05.194994Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.196169Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:21:05.217500Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:21:05.218032Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:21:05.218041Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.218882Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:21:05.219255Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:21:05.223925Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:21:05.224140Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:21:05.225056Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:21:05.225070Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.225362Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:21:05.225381Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.226531Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:21:05.232856Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:21:05.242941Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:21:05.390409Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:21:05.421266Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:21:05.421291Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.459411Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:21:05.576645Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:21:05.610709Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:21:05.610746Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.623916Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:21:05.637452Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:21:05.637855Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:21:05.637879Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.641769Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:21:05.644525Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:21:05.671667Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:21:05.672651Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:21:05.672675Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.675987Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:21:05.687473Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:21:05.687888Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:05.687898Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.688901Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:21:05.693872Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:21:05.698102Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:21:05.699159Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:21:05.701154Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:21:05.701179Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.706180Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:21:05.717893Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:21:05.718276Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:05.718286Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.719599Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:21:05.728640Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:21:05.728968Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:05.728976Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.729820Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:21:05.734400Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:21:05.738475Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:21:05.739578Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:21:05.740098Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:21:05.747545Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:21:05.747700Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:21:05.763091Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:21:05.771351Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:21:05.771680Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:21:05.771698Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.782971Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:21:05.801258Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:21:05.808268Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:21:05.808295Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.809400Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:21:05.809420Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.823744Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:21:05.830151Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:21:05.830198Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.840151Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:21:05.844860Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:21:05.851821Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:21:05.852181Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:21:05.852190Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.853092Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:21:05.876814Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:21:05.877583Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:21:05.877594Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.879024Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:21:05.888229Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:21:05.888688Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:05.888699Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.889891Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:21:05.895069Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:21:05.900160Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:21:05.900199Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:05.906898Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:21:05.907381Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:21:05.907392Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.908941Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:21:05.909134Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:21:05.916807Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:21:05.932906Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:21:05.938885Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:21:05.938907Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.943323Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:21:05.943776Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:05.943786Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.944777Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:21:05.949938Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:21:05.953751Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:21:05.954245Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:21:05.962657Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:21:05.962974Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:05.962981Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.963880Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:21:05.968753Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:21:05.976146Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:21:05.982472Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:21:05.982954Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:21:05.982963Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.984770Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:21:05.989071Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:21:05.989089Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:05.991594Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:21:05.997086Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:21:05.997104Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.005943Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:21:06.010343Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:21:06.011873Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:21:06.015290Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:21:06.015351Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.020026Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:21:06.040906Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:21:06.059402Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:21:06.059433Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.070473Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:21:06.090760Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:21:06.090795Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:06.098880Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:21:06.103087Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:21:06.104309Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:21:06.104330Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.107698Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:21:06.126424Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:21:06.127184Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:06.127215Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.128969Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:21:06.135457Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:21:06.140368Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:21:06.149665Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:21:06.150065Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:06.150073Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.151141Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:21:06.156508Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:21:06.170192Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:21:06.170838Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:21:06.170848Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.172960Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:21:06.318881Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:21:06.318925Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:06.353693Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:21:06.361382Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:21:06.393021Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:21:06.393045Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.397672Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:21:06.412322Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:21:06.412843Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:06.412854Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.414596Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:21:06.420792Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:21:06.439243Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:21:06.458813Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:21:06.459749Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:06.459781Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.462547Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:21:06.557629Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:21:06.572157Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:21:06.572188Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.579836Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:21:06.602547Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:21:06.603406Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:21:06.603421Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.606044Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:21:06.635990Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:21:06.684375Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:21:06.703947Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:21:06.711827Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:21:06.711854Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.721731Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:21:06.721766Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.739983Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:21:06.740011Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.742923Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:21:06.749718Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:21:06.761789Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:21:06.761810Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:06.773191Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=18 candidates=6660 ordinary_horizon=5680 paired_horizon=11275 use_paired=false
2026-09-12T18:21:06.774186Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:21:06.778163Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:21:06.823733Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:21:06.837647Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:21:06.837682Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5680 selected_horizon=5680 endpoint_lower_bound=4656 lower_bound_gap=1024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:06.868065Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=344 horizon=5680
2026-09-12T18:21:06.898565Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:21:06.951334Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:21:06.951361Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.021155Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:21:07.071667Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:21:07.087101Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:21:07.087570Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:07.087591Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.089162Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:21:07.104801Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:21:07.136975Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:07.137007Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.137517Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:21:07.148222Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:21:07.148243Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.166519Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:21:07.174142Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:21:07.199226Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:21:07.199810Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:07.199817Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.201342Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:21:07.263936Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:21:07.267528Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:21:07.267558Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.272097Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:21:07.383341Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:21:07.400390Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:21:07.400417Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.426590Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:21:07.506499Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:21:07.536961Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:21:07.536986Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.577870Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:21:07.608250Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:21:07.636321Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:21:07.642476Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:21:07.642500Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.664556Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:21:07.668074Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:21:07.684582Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:21:07.684616Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.685721Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:21:07.685750Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.685726Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:21:07.699732Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:21:07.705469Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:21:07.705491Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.736164Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:21:07.738642Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:21:07.741464Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:21:07.741484Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.748646Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:21:07.763026Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:21:07.774658Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:21:07.774693Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:07.776497Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:21:07.776913Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:21:07.776922Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.777308Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:21:07.778008Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:21:07.782689Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:21:07.805501Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:21:07.833245Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:21:07.835486Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:21:07.835504Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.837938Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=723 row_words=33 horizon=2545
2026-09-12T18:21:07.847176Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:21:07.852857Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:21:07.852876Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.859863Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:21:07.869267Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:21:07.879515Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:21:07.879907Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:21:07.879915Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.880744Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:21:07.883239Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:21:07.885260Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:21:07.911166Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:07.911219Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.947659Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:21:07.975314Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:21:07.977001Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:21:07.980103Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:21:07.980666Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:07.980678Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.982586Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:21:07.986799Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:21:07.986820Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:07.999653Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:21:08.016670Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:21:08.016703Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.050979Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:21:08.053087Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:21:08.053106Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.055478Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:21:08.065262Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:21:08.117128Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:21:08.131786Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:21:08.131815Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.149599Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:21:08.205031Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:21:08.224386Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:21:08.224408Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.235236Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:21:08.244796Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:21:08.250466Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:21:08.250486Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.257452Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:21:08.260482Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:21:08.267196Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:21:08.282683Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:21:08.283353Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:21:08.283377Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.284735Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:21:08.291937Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:21:08.300319Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:08.300356Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.341176Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:21:08.364477Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:21:08.364517Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:08.364804Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:21:08.365403Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:08.365422Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.366716Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:21:08.394689Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:21:08.459907Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:21:08.464508Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:21:08.464574Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.468659Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:21:08.473296Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:21:08.493466Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:21:08.493489Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.506022Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:21:08.513744Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:21:08.542738Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:08.542762Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.561504Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:21:08.561542Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:08.569542Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:21:08.578239Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:21:08.600661Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:21:08.601114Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:08.601122Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.602560Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:21:08.616671Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:21:08.675240Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:21:08.675277Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.745190Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:21:08.831500Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:21:08.845264Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:21:08.908909Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:21:08.908932Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.931079Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:21:08.953265Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:21:08.953296Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:08.964812Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:21:08.972545Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:21:08.972581Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:09.005405Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:21:09.006822Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:21:09.006840Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.009588Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=1452 row_words=15 horizon=3578
2026-09-12T18:21:09.014237Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:21:09.033470Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:21:09.135663Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:21:09.157709Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:21:09.173381Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:21:09.173430Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:09.202500Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:21:09.202532Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.206352Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:21:09.237894Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:21:09.237945Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.260480Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:21:09.290131Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:09.290155Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.291549Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:21:09.331001Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:21:09.359840Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:21:09.368594Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:21:09.369464Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:09.369493Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.371580Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:21:09.378720Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:21:09.378753Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:09.389327Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:21:09.413805Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:21:09.423051Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:21:09.424190Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:21:09.424232Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.427008Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:21:09.493243Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:21:09.493277Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12868 selected_horizon=12868 endpoint_lower_bound=11940 lower_bound_gap=928 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.511716Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:21:09.516096Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:21:09.516117Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.519243Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:21:09.520001Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:21:09.550692Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=628 horizon=12868
2026-09-12T18:21:09.551705Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:21:09.551728Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.598837Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:21:09.714736Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:21:09.714776Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:09.744313Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:21:09.876519Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:21:09.888023Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:21:09.888047Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.889496Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:21:09.890589Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:21:09.890619Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:09.900715Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:21:09.917521Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:21:09.917558Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.924183Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:21:09.949644Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:21:09.952597Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:21:09.953158Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:09.953169Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.954588Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:21:09.990318Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:21:09.992194Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:21:09.992234Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:09.996755Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:21:10.000059Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:21:10.011785Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:21:10.023659Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:21:10.023680Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.036950Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:21:10.046727Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:21:10.054621Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:21:10.067816Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:21:10.068259Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:10.068270Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.069941Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:21:10.079987Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:21:10.080386Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:10.080395Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.081514Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:21:10.086608Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:21:10.091108Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:21:10.092398Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:21:10.092997Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:21:10.118141Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:21:10.186034Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:21:10.191978Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:21:10.196757Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:21:10.196778Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.204812Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:21:10.218776Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:21:10.219238Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:21:10.219248Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.220458Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:21:10.247494Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:21:10.248288Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:21:10.248301Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.250168Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:21:10.252245Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:21:10.252266Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.324300Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:21:10.353175Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:21:10.361559Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:21:10.368509Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:21:10.368534Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.374453Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:21:10.403422Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:21:10.417657Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:21:10.417688Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.424162Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:21:10.424190Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.451606Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:21:10.526780Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:21:10.570797Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:21:10.571615Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:21:10.571629Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.574056Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:21:10.597395Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:21:10.618137Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:21:10.618175Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:10.631440Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:21:10.694336Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:21:10.694385Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:10.696937Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:21:10.697220Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.709537Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=452 row_words=53 horizon=8353
2026-09-12T18:21:10.869152Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:21:10.932400Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:21:10.933581Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:21:10.933596Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:10.936482Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:21:11.010591Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:21:11.025264Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:21:11.025289Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.033669Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:21:11.037680Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:21:11.056815Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:21:11.057550Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:21:11.057562Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.060327Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:21:11.064849Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:21:11.064874Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.076628Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:21:11.077373Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:11.077396Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.079326Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:21:11.087975Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:21:11.093819Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:21:11.100171Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:21:11.244170Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:21:11.249872Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:21:11.249895Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.251547Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:21:11.256070Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:21:11.259069Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:21:11.288848Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:21:11.320439Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:21:11.320482Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.335267Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:21:11.335304Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.341558Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:21:11.357661Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:21:11.357699Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.401075Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:21:11.403287Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:21:11.403305Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.405851Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:21:11.429473Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:21:11.474384Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:21:11.475292Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:21:11.475307Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.477756Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:21:11.495851Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:21:11.539814Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:21:11.540303Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:11.540316Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.541391Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:21:11.542898Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:21:11.546628Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:21:11.559198Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:21:11.559735Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:21:11.559745Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.561631Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:21:11.569282Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:21:11.569317Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:11.601603Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:21:11.609318Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:21:11.609344Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.662281Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:21:11.696817Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:21:11.775764Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:21:11.775796Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.801328Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:21:11.833605Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:21:11.841146Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:21:11.868653Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:21:11.868690Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.871441Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:21:11.884014Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:21:11.884040Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.890238Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:21:11.904771Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:21:11.905224Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:11.905239Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:11.907075Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:21:11.913697Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:21:11.925601Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:21:11.929046Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:21:12.011801Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:21:12.011838Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:12.058516Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:21:12.058550Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:12.061988Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:21:12.063457Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:21:12.089939Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:21:12.090003Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:12.105190Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:21:12.106353Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:21:12.106370Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:12.108838Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:21:12.117674Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:21:12.124320Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:21:12.149757Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:21:12.149816Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:12.169198Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:21:12.259884Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:21:12.265856Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:21:12.265878Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:12.272629Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:21:12.282100Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:21:12.293271Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:21:12.293834Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:21:12.293854Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:12.295298Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:21:12.299875Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:21:12.500400Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:21:12.551665Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:21:12.551703Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:12.587028Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:21:12.781646Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:21:12.781686Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:12.794071Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:21:12.829729Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:21:12.845277Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:21:12.879268Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:21:12.879309Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:12.907070Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:21:12.928346Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:21:12.933755Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:21:12.933787Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=8787 selected_horizon=8787 endpoint_lower_bound=7680 lower_bound_gap=1107 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:12.936009Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:21:12.942615Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:21:12.942636Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:12.959558Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:21:12.959587Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:12.960858Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=960 row_words=146 horizon=8787
2026-09-12T18:21:12.970123Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:21:12.973075Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:21:12.980694Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:21:12.990936Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:21:12.992678Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:21:12.992699Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:12.996338Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:21:13.007235Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:21:13.058354Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:21:13.058397Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:13.081268Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:21:13.081303Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.094440Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=25
2026-09-12T18:21:13.096746Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:21:13.096775Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:13.106398Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=20982 maximum_identical_destinations=1
2026-09-12T18:21:13.106417Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=3396 selected_horizon=3396 endpoint_lower_bound=2560 lower_bound_gap=836 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.114156Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:21:13.117533Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1259 row_words=69 horizon=3396
2026-09-12T18:21:13.140816Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:21:13.146855Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:21:13.202067Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:21:13.238049Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:21:13.238086Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:13.252089Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:21:13.260480Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:21:13.263292Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:21:13.263318Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.269008Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:21:13.269039Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:13.271753Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:21:13.297838Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:21:13.297862Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.304769Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:21:13.305768Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:21:13.305784Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.308547Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:21:13.312628Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:21:13.316019Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:21:13.322586Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:21:13.322604Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.325063Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:21:13.340496Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:21:13.342687Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:21:13.350555Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:21:13.350600Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.361757Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:21:13.363917Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:21:13.387217Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:21:13.387319Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:21:13.388424Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:21:13.388442Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.391138Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:21:13.443608Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:21:13.452318Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:21:13.452353Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.468527Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:21:13.468548Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.469486Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:21:13.491918Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:21:13.495937Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:21:13.495959Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.498749Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:21:13.522358Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:21:13.522380Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.523406Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:21:13.566913Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:21:13.586914Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:21:13.682395Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:21:13.684537Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:21:13.684555Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.686987Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:21:13.699499Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:21:13.732029Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:21:13.732067Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.763564Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:21:13.772583Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:21:13.772621Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:13.778263Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:21:13.785121Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:21:13.788933Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:21:13.798912Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:21:13.799326Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:13.799335Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.800486Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:21:13.822996Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:21:13.823035Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:13.838986Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:21:13.839011Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.839869Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:21:13.875609Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:21:13.875657Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.877802Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:21:13.879196Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:21:13.879252Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:13.914553Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:21:13.914587Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.916190Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:21:13.917414Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:21:13.920172Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:21:13.920265Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:21:13.946170Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:21:13.963683Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:21:13.963715Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.982824Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:21:13.982851Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:13.997898Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:21:14.034118Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:21:14.039723Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:21:14.181686Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:21:14.206554Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:21:14.206590Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:14.207018Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:21:14.216247Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:21:14.218839Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:21:14.226626Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=2187 maximum_identical_destinations=1
2026-09-12T18:21:14.226650Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=16242 selected_horizon=16242 endpoint_lower_bound=15744 lower_bound_gap=498 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:14.237728Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:21:14.239295Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=720 row_words=180 horizon=16242
2026-09-12T18:21:14.239339Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:21:14.239354Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:14.245530Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:21:14.245568Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:14.279319Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:21:14.284246Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:21:14.381665Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:21:14.412566Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:14.412613Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:14.457273Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:21:14.488914Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:21:14.525367Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:21:14.525398Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:14.541793Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:21:14.541829Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:14.543019Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:21:14.565392Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:21:14.571960Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:21:14.612827Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:21:14.612863Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:14.625024Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:21:14.636042Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:21:14.636076Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:14.641663Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:21:14.706745Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:21:14.706788Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:14.728646Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:21:14.785252Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:21:14.975571Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:21:14.975608Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:15.062297Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:21:15.094569Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:21:15.098102Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:21:15.122857Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:21:15.122883Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:15.138417Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:21:15.138442Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:15.156682Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:21:15.170190Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:21:15.354181Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:21:15.382538Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:21:15.382564Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:15.410441Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:21:15.510028Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:21:15.590600Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:21:15.590640Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:15.648043Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:21:15.666542Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=13235 success=true
2026-09-12T18:21:15.914406Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:21:15.914442Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:15.942406Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:21:16.015195Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:21:16.021398Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:21:16.021618Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:16.083688Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:21:16.083714Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.108764Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:21:16.169801Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:21:16.209086Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:21:16.210099Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:21:16.210114Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.212235Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:21:16.293642Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:21:16.370097Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=194092 maximum_identical_destinations=1
2026-09-12T18:21:16.370121Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2824 selected_horizon=2824 endpoint_lower_bound=2152 lower_bound_gap=672 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.501577Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=80 row_words=405 horizon=2824
2026-09-12T18:21:16.522494Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:21:16.522532Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:16.595555Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:21:16.618853Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=14183 success=true
2026-09-12T18:21:16.761262Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="place_storage"}: package build phase finished phase="place_storage" elapsed_ms=13258 success=true
2026-09-12T18:21:16.765929Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=48
2026-09-12T18:21:16.776168Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=40
2026-09-12T18:21:16.776622Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=40 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:16.776641Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=40 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.777088Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=49
2026-09-12T18:21:16.777716Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=40 tile=47 row_words=23 horizon=374
2026-09-12T18:21:16.781526Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=32
2026-09-12T18:21:16.782251Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=32 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:16.782264Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=32 initial_horizon=2978 selected_horizon=2978 endpoint_lower_bound=2304 lower_bound_gap=674 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.782601Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=39
2026-09-12T18:21:16.783095Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=41
2026-09-12T18:21:16.783116Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=39 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:16.783127Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=39 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.784070Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=32 tile=13 row_words=21 horizon=2978
2026-09-12T18:21:16.784839Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=39 tile=866 row_words=10 horizon=471
2026-09-12T18:21:16.788877Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=38
2026-09-12T18:21:16.790709Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=4
2026-09-12T18:21:16.791990Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=4 transfers=3650 maximum_identical_destinations=1
2026-09-12T18:21:16.792003Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=4 initial_horizon=1927 selected_horizon=1927 endpoint_lower_bound=1152 lower_bound_gap=775 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.794851Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=4 tile=21 row_words=25 horizon=1927
2026-09-12T18:21:16.795447Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=50
2026-09-12T18:21:16.795942Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=50 transfers=1294 maximum_identical_destinations=1
2026-09-12T18:21:16.795959Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=50 initial_horizon=471 selected_horizon=471 endpoint_lower_bound=256 lower_bound_gap=215 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.796190Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=42
2026-09-12T18:21:16.796686Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=42 transfers=1745 maximum_identical_destinations=1
2026-09-12T18:21:16.796699Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=42 initial_horizon=2165 selected_horizon=2165 endpoint_lower_bound=900 lower_bound_gap=1265 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.798465Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=50 tile=866 row_words=10 horizon=471
2026-09-12T18:21:16.798776Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=42 tile=6 row_words=44 horizon=2165
2026-09-12T18:21:16.801909Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=5
2026-09-12T18:21:16.813497Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=51
2026-09-12T18:21:16.813978Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=51 transfers=1224 maximum_identical_destinations=1
2026-09-12T18:21:16.813989Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=51 initial_horizon=374 selected_horizon=374 endpoint_lower_bound=272 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.815629Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=51 tile=47 row_words=23 horizon=374
2026-09-12T18:21:16.817450Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=27
2026-09-12T18:21:16.819073Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=27 transfers=2820 maximum_identical_destinations=1
2026-09-12T18:21:16.819092Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=27 initial_horizon=3578 selected_horizon=3578 endpoint_lower_bound=1076 lower_bound_gap=2502 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.822942Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=27 tile=157 row_words=16 horizon=3578
2026-09-12T18:21:16.823050Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=52
2026-09-12T18:21:16.829548Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=53
2026-09-12T18:21:16.831285Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=54
2026-09-12T18:21:16.832066Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=55
2026-09-12T18:21:16.838561Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=33
2026-09-12T18:21:16.848484Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=6
2026-09-12T18:21:16.862445Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=7
2026-09-12T18:21:16.871297Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=56
2026-09-12T18:21:16.968750Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=57
2026-09-12T18:21:16.974424Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=57 transfers=9654 maximum_identical_destinations=1
2026-09-12T18:21:16.974445Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=57 initial_horizon=1690 selected_horizon=1690 endpoint_lower_bound=1280 lower_bound_gap=410 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.984935Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=57 tile=943 row_words=46 horizon=1690
2026-09-12T18:21:16.985578Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=44
2026-09-12T18:21:16.988025Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=58
2026-09-12T18:21:16.988489Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=58 transfers=1288 maximum_identical_destinations=1
2026-09-12T18:21:16.988505Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=58 initial_horizon=326 selected_horizon=326 endpoint_lower_bound=224 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.989807Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=58 tile=89 row_words=15 horizon=326
2026-09-12T18:21:16.990506Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=44 transfers=12492 maximum_identical_destinations=1
2026-09-12T18:21:16.990527Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=44 initial_horizon=7129 selected_horizon=7129 endpoint_lower_bound=6756 lower_bound_gap=373 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:16.995954Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=44 tile=32 row_words=134 horizon=7129
2026-09-12T18:21:16.999350Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=2
2026-09-12T18:21:17.003386Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=45
2026-09-12T18:21:17.006896Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=2 transfers=16520 maximum_identical_destinations=1
2026-09-12T18:21:17.006925Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=2 initial_horizon=3661 selected_horizon=3661 endpoint_lower_bound=3040 lower_bound_gap=621 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.015142Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=46
2026-09-12T18:21:17.015537Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=46 transfers=1152 maximum_identical_destinations=1
2026-09-12T18:21:17.015547Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=46 initial_horizon=5743 selected_horizon=5743 endpoint_lower_bound=5632 lower_bound_gap=111 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.016255Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=46 tile=79 row_words=46 horizon=5743
2026-09-12T18:21:17.020186Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=47
2026-09-12T18:21:17.020250Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=2 tile=1061 row_words=90 horizon=3661
2026-09-12T18:21:17.025540Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=59
2026-09-12T18:21:17.026460Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=59 transfers=2151 maximum_identical_destinations=1
2026-09-12T18:21:17.026477Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=59 initial_horizon=172 selected_horizon=172 endpoint_lower_bound=64 lower_bound_gap=108 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.028271Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=59 tile=1109 row_words=40 horizon=172
2026-09-12T18:21:17.046991Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:21:17.047073Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:17.049817Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=35
2026-09-12T18:21:17.052842Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=35 transfers=1296 maximum_identical_destinations=1
2026-09-12T18:21:17.052890Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=35 initial_horizon=4287 selected_horizon=4287 endpoint_lower_bound=4096 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.057793Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=35 tile=1146 row_words=20 horizon=4287
2026-09-12T18:21:17.074462Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=9
2026-09-12T18:21:17.076706Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=62
2026-09-12T18:21:17.077120Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=62 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:17.077130Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=62 initial_horizon=406 selected_horizon=406 endpoint_lower_bound=304 lower_bound_gap=102 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.078003Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=62 tile=47 row_words=25 horizon=406
2026-09-12T18:21:17.082641Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=63
2026-09-12T18:21:17.086441Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=64
2026-09-12T18:21:17.102607Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=9 transfers=50544 maximum_identical_destinations=1
2026-09-12T18:21:17.102631Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=9 initial_horizon=9085 selected_horizon=9085 endpoint_lower_bound=7424 lower_bound_gap=1661 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.126463Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:21:17.136100Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=9 tile=473 row_words=171 horizon=9085
2026-09-12T18:21:17.154251Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=22
2026-09-12T18:21:17.155992Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=22 transfers=1475 maximum_identical_destinations=1
2026-09-12T18:21:17.156007Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=22 initial_horizon=2545 selected_horizon=2545 endpoint_lower_bound=1728 lower_bound_gap=817 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.157657Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=22 tile=104 row_words=36 horizon=2545
2026-09-12T18:21:17.166860Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=61
2026-09-12T18:21:17.167526Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=61 transfers=1725 maximum_identical_destinations=1
2026-09-12T18:21:17.167538Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=61 initial_horizon=1112 selected_horizon=1112 endpoint_lower_bound=896 lower_bound_gap=216 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.169418Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=61 tile=1357 row_words=14 horizon=1112
2026-09-12T18:21:17.175121Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:21:17.228033Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=11
2026-09-12T18:21:17.228977Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=11 transfers=2337 maximum_identical_destinations=1
2026-09-12T18:21:17.228992Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=11 initial_horizon=3224 selected_horizon=3224 endpoint_lower_bound=1440 lower_bound_gap=1784 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.231197Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=11 tile=162 row_words=23 horizon=3224
2026-09-12T18:21:17.244295Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:21:17.244325Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.277375Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=17
2026-09-12T18:21:17.282195Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=17 transfers=11656 maximum_identical_destinations=1
2026-09-12T18:21:17.282232Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=17 initial_horizon=2720 selected_horizon=2720 endpoint_lower_bound=2304 lower_bound_gap=416 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.287835Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=17 tile=20 row_words=155 horizon=2720
2026-09-12T18:21:17.300282Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=25 transfers=8694 maximum_identical_destinations=1
2026-09-12T18:21:17.300317Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=25 initial_horizon=10602 selected_horizon=10602 endpoint_lower_bound=7872 lower_bound_gap=2730 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:17.310311Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=25 tile=1428 row_words=47 horizon=10602
2026-09-12T18:21:17.340097Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:21:17.355962Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=16
2026-09-12T18:21:17.368876Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:21:17.376078Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=21
2026-09-12T18:21:17.376691Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=21 transfers=1457 maximum_identical_destinations=1
2026-09-12T18:21:17.376703Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=21 initial_horizon=2909 selected_horizon=2909 endpoint_lower_bound=2304 lower_bound_gap=605 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.378547Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=21 tile=22 row_words=23 horizon=2909
2026-09-12T18:21:17.381948Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=16 transfers=50960 maximum_identical_destinations=1
2026-09-12T18:21:17.381969Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=16 initial_horizon=2673 selected_horizon=2673 endpoint_lower_bound=1960 lower_bound_gap=713 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.414340Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=16 tile=455 row_words=131 horizon=2673
2026-09-12T18:21:17.424507Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=36
2026-09-12T18:21:17.437325Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=24 transfers=9684 maximum_identical_destinations=1
2026-09-12T18:21:17.437361Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=24 initial_horizon=9286 selected_horizon=9286 endpoint_lower_bound=7680 lower_bound_gap=1606 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:17.441466Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:21:17.441492Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.447311Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=36 transfers=45090 maximum_identical_destinations=1
2026-09-12T18:21:17.447340Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=36 initial_horizon=7433 selected_horizon=7433 endpoint_lower_bound=6048 lower_bound_gap=1385 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.461487Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=29 transfers=3096 maximum_identical_destinations=1
2026-09-12T18:21:17.461514Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=29 initial_horizon=8353 selected_horizon=8353 endpoint_lower_bound=5120 lower_bound_gap=3233 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:17.464742Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=24 tile=746 row_words=143 horizon=9286
2026-09-12T18:21:17.474526Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=29 tile=1424 row_words=52 horizon=8353
2026-09-12T18:21:17.477674Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=36 tile=1090 row_words=186 horizon=7433
2026-09-12T18:21:17.492283Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:21:17.615265Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=60
2026-09-12T18:21:17.629072Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=60 transfers=1076 maximum_identical_destinations=1
2026-09-12T18:21:17.629096Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=60 initial_horizon=531 selected_horizon=531 endpoint_lower_bound=112 lower_bound_gap=419 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.636352Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=60 tile=1075 row_words=94 horizon=531
2026-09-12T18:21:17.839936Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=20
2026-09-12T18:21:17.875084Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=20 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:17.875132Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=20 initial_horizon=850 selected_horizon=850 endpoint_lower_bound=576 lower_bound_gap=274 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:17.916054Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=20 tile=356 row_words=177 horizon=850
2026-09-12T18:21:17.959980Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=15
2026-09-12T18:21:17.995522Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=15 transfers=71104 maximum_identical_destinations=1
2026-09-12T18:21:17.995545Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=15 initial_horizon=11776 selected_horizon=11776 endpoint_lower_bound=8768 lower_bound_gap=3008 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:18.022356Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=34
2026-09-12T18:21:18.036436Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=15 tile=79 row_words=272 horizon=11776
2026-09-12T18:21:18.049831Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=34 transfers=6561 maximum_identical_destinations=1
2026-09-12T18:21:18.049870Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=34 initial_horizon=7923 selected_horizon=7923 endpoint_lower_bound=5248 lower_bound_gap=2675 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:18.051421Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=31
2026-09-12T18:21:18.065562Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=34 tile=263 row_words=252 horizon=7923
2026-09-12T18:21:18.077775Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=31 transfers=51925 maximum_identical_destinations=1
2026-09-12T18:21:18.077801Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=31 initial_horizon=822 selected_horizon=822 endpoint_lower_bound=576 lower_bound_gap=246 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:18.106556Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=31 tile=1095 row_words=135 horizon=822
2026-09-12T18:21:18.360743Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=43
2026-09-12T18:21:18.404542Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=43 transfers=69906 maximum_identical_destinations=1
2026-09-12T18:21:18.404592Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=43 initial_horizon=5349 selected_horizon=5349 endpoint_lower_bound=2816 lower_bound_gap=2533 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:18.448526Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=43 tile=81 row_words=489 horizon=5349
2026-09-12T18:21:18.491074Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=28
2026-09-12T18:21:18.534812Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=28 transfers=21111 maximum_identical_destinations=1
2026-09-12T18:21:18.534838Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=28 initial_horizon=10169 selected_horizon=10169 endpoint_lower_bound=9760 lower_bound_gap=409 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:18.569155Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=28 tile=481 row_words=518 horizon=10169
2026-09-12T18:21:18.815886Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=14 transfers=66320 maximum_identical_destinations=1
2026-09-12T18:21:18.815926Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=14 initial_horizon=7003 selected_horizon=7003 endpoint_lower_bound=3240 lower_bound_gap=3763 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:18.858925Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=14 tile=322 row_words=279 horizon=7003
2026-09-12T18:21:18.895041Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=18
2026-09-12T18:21:18.930500Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=18 transfers=8388 maximum_identical_destinations=1
2026-09-12T18:21:18.930528Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=18 initial_horizon=5710 selected_horizon=5710 endpoint_lower_bound=4656 lower_bound_gap=1054 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:18.958982Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=18 tile=36 row_words=356 horizon=5710
2026-09-12T18:21:19.108597Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=10
2026-09-12T18:21:19.117385Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=37
2026-09-12T18:21:19.159028Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=37 transfers=103635 maximum_identical_destinations=1
2026-09-12T18:21:19.159054Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=37 initial_horizon=1463 selected_horizon=1463 endpoint_lower_bound=1152 lower_bound_gap=311 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:19.171572Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=10 transfers=155252 maximum_identical_destinations=1
2026-09-12T18:21:19.171594Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=10 initial_horizon=2258 selected_horizon=2258 endpoint_lower_bound=1728 lower_bound_gap=530 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:19.217557Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=37 tile=235 row_words=253 horizon=1463
2026-09-12T18:21:19.265758Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=10 tile=231 row_words=310 horizon=2258
2026-09-12T18:21:19.353678Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=13
2026-09-12T18:21:19.422244Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=13 transfers=33676 maximum_identical_destinations=1
2026-09-12T18:21:19.422278Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=13 initial_horizon=12637 selected_horizon=12637 endpoint_lower_bound=11940 lower_bound_gap=697 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:19.470196Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=13 tile=79 row_words=630 horizon=12637
2026-09-12T18:21:19.488803Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=17047 success=true
2026-09-12T18:21:20.228766Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=12
2026-09-12T18:21:20.286704Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=12 transfers=128094 maximum_identical_destinations=1
2026-09-12T18:21:20.286730Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=12 initial_horizon=4455 selected_horizon=4455 endpoint_lower_bound=1440 lower_bound_gap=3015 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:20.373831Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=12 tile=201 row_words=627 horizon=4455
2026-09-12T18:21:20.447147Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=26
2026-09-12T18:21:20.541820Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=26 transfers=195689 maximum_identical_destinations=1
2026-09-12T18:21:20.541848Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=26 initial_horizon=2731 selected_horizon=2731 endpoint_lower_bound=2152 lower_bound_gap=579 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:20.549275Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=30 transfers=112284 maximum_identical_destinations=1
2026-09-12T18:21:20.549316Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=30 initial_horizon=10541 selected_horizon=10541 endpoint_lower_bound=9072 lower_bound_gap=1469 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:20.615266Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=30 tile=704 row_words=423 horizon=10541
2026-09-12T18:21:20.695679Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=26 tile=553 row_words=658 horizon=2731
2026-09-12T18:21:20.722763Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18289 success=true
2026-09-12T18:21:20.903006Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=23
2026-09-12T18:21:20.921942Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=23 transfers=4374 maximum_identical_destinations=1
2026-09-12T18:21:20.921965Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=23 initial_horizon=8082 selected_horizon=8082 endpoint_lower_bound=7872 lower_bound_gap=210 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:20.933285Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=23 tile=414 row_words=336 horizon=8082
2026-09-12T18:21:21.166852Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=19
2026-09-12T18:21:21.177308Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=19 transfers=20656 maximum_identical_destinations=1
2026-09-12T18:21:21.177353Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=19 initial_horizon=4485 selected_horizon=4485 endpoint_lower_bound=3648 lower_bound_gap=837 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:21.194586Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=19 tile=535 row_words=106 horizon=4485
2026-09-12T18:21:21.200717Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=21233 success=true
2026-09-12T18:21:21.201273Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=18757 success=true
2026-09-12T18:21:21.391514Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=0
2026-09-12T18:21:21.411352Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=0 transfers=2421 maximum_identical_destinations=1
2026-09-12T18:21:21.411382Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=0 initial_horizon=6634 selected_horizon=6634 endpoint_lower_bound=2944 lower_bound_gap=3690 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:21.425604Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=0 tile=359 row_words=389 horizon=6634
2026-09-12T18:21:21.461027Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=1
2026-09-12T18:21:21.462706Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=1 transfers=1368 maximum_identical_destinations=1
2026-09-12T18:21:21.462725Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=1 initial_horizon=703 selected_horizon=703 endpoint_lower_bound=512 lower_bound_gap=191 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:21.465837Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=1 tile=1109 row_words=14 horizon=703
2026-09-12T18:21:21.959290Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: reused exchange optimization after validating relocated rows phase=3
2026-09-12T18:21:21.994243Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=3 transfers=51948 maximum_identical_destinations=1
2026-09-12T18:21:21.994269Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=3 initial_horizon=846 selected_horizon=846 endpoint_lower_bound=576 lower_bound_gap=270 selected_kind="reused" neighborhood_improvements=0
2026-09-12T18:21:22.026027Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=3 tile=356 row_words=177 horizon=846
2026-09-12T18:21:22.042065Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=19606 success=true
2026-09-12T18:21:24.431902Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: compared ordinary and paired exchange schedules phase=8 candidates=6588 ordinary_horizon=14880 paired_horizon=24695 use_paired=false
2026-09-12T18:21:24.557125Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: prepared large physical exchange phase phase=8 transfers=9180 maximum_identical_destinations=1
2026-09-12T18:21:24.557162Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: optimized physical exchange schedule phase=8 initial_horizon=14880 selected_horizon=14880 endpoint_lower_bound=9856 lower_bound_gap=5024 selected_kind="balanced-compact-streams" neighborhood_improvements=0
2026-09-12T18:21:24.602492Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: finished large physical exchange phase phase=8 tile=45 row_words=644 horizon=14880
2026-09-12T18:21:24.622275Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="lower_exchanges"}: package build phase finished phase="lower_exchanges" elapsed_ms=7860 success=true
2026-09-12T18:21:25.581880Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9915 success=true
2026-09-12T18:21:25.615409Z  INFO local_candidate{attempt=58}: costed final placed program final_cycles=11831499 final_exchange=4933626
2026-09-12T18:21:26.613165Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9994 success=true
2026-09-12T18:21:26.639568Z  INFO local_candidate{attempt=62}: costed final placed program final_cycles=11823228 final_exchange=4924624
2026-09-12T18:21:26.983961Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=133 success=true
2026-09-12T18:21:27.073554Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=89 success=true
2026-09-12T18:21:27.555911Z  INFO local_candidate{attempt=58}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=426 success=true
2026-09-12T18:21:27.835949Z  INFO local_candidate{attempt=58}: retained faster incumbent candidate_cycles=11831499 cycles=11823228
2026-09-12T18:21:27.992916Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=138 success=true
2026-09-12T18:21:28.080855Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=87 success=true
2026-09-12T18:21:28.531849Z  INFO local_candidate{attempt=62}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=397 success=true
2026-09-12T18:21:28.778101Z  INFO local_candidate{attempt=62}: retained faster incumbent candidate_cycles=11823228 cycles=11823228
2026-09-12T18:21:29.623145Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10134 success=true
2026-09-12T18:21:29.664718Z  INFO local_candidate{attempt=60}: costed final placed program final_cycles=11823228 final_exchange=4924624
2026-09-12T18:21:30.436533Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9713 success=true
2026-09-12T18:21:30.462431Z  INFO local_candidate{attempt=55}: costed final placed program final_cycles=12054078 final_exchange=4939420
2026-09-12T18:21:30.769828Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9568 success=true
2026-09-12T18:21:30.797416Z  INFO local_candidate{attempt=57}: costed final placed program final_cycles=12054078 final_exchange=4939420
2026-09-12T18:21:30.936561Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=90 success=true
2026-09-12T18:21:31.030593Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=93 success=true
2026-09-12T18:21:31.472592Z  INFO local_candidate{attempt=60}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=385 success=true
2026-09-12T18:21:31.761892Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=89 success=true
2026-09-12T18:21:31.835002Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=9792 success=true
2026-09-12T18:21:31.854038Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=92 success=true
2026-09-12T18:21:31.863140Z  INFO local_candidate{attempt=56}: costed final placed program final_cycles=12054078 final_exchange=4939420
2026-09-12T18:21:31.922159Z  INFO local_candidate{attempt=60}: retained faster incumbent candidate_cycles=11823228 cycles=11823228
2026-09-12T18:21:31.951419Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10750 success=true
2026-09-12T18:21:31.978684Z  INFO local_candidate{attempt=61}: costed final placed program final_cycles=11823228 final_exchange=4924624
2026-09-12T18:21:32.044192Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=100 success=true
2026-09-12T18:21:32.130396Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=86 success=true
2026-09-12T18:21:32.335447Z  INFO local_candidate{attempt=55}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=427 success=true
2026-09-12T18:21:32.564465Z  INFO local_candidate{attempt=57}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=384 success=true
2026-09-12T18:21:32.588423Z  INFO local_candidate{attempt=55}: retained faster incumbent candidate_cycles=12054078 cycles=11823228
2026-09-12T18:21:32.895927Z  INFO local_candidate{attempt=57}: retained faster incumbent candidate_cycles=12054078 cycles=11823228
2026-09-12T18:21:33.117638Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=102 success=true
2026-09-12T18:21:33.221882Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=104 success=true
2026-09-12T18:21:33.265005Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=98 success=true
2026-09-12T18:21:33.388868Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=123 success=true
2026-09-12T18:21:33.745439Z  INFO local_candidate{attempt=56}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=426 success=true
2026-09-12T18:21:33.941050Z  INFO local_candidate{attempt=61}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=488 success=true
2026-09-12T18:21:34.029379Z  INFO local_candidate{attempt=56}: retained faster incumbent candidate_cycles=12054078 cycles=11823228
2026-09-12T18:21:34.383526Z  INFO local_candidate{attempt=61}: retained faster incumbent candidate_cycles=11823228 cycles=11823228
2026-09-12T18:21:35.242065Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="optimize_exchange_placement"}: package build phase finished phase="optimize_exchange_placement" elapsed_ms=10619 success=true
2026-09-12T18:21:35.268298Z  INFO local_candidate{attempt=59}: costed final placed program final_cycles=11823228 final_exchange=4924624
2026-09-12T18:21:36.562973Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="prepare_tile_code"}: package build phase finished phase="prepare_tile_code" elapsed_ms=87 success=true
2026-09-12T18:21:36.654641Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="emit_tile_code"}: package build phase finished phase="emit_tile_code" elapsed_ms=91 success=true
2026-09-12T18:21:37.091694Z  INFO local_candidate{attempt=59}:ipu_codegen.package.phase{phase="build_tile_images"}: package build phase finished phase="build_tile_images" elapsed_ms=390 success=true
2026-09-12T18:21:37.345528Z  INFO local_candidate{attempt=59}: retained faster incumbent candidate_cycles=11823228 cycles=11823228
2026-09-12T18:21:38.008744Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: saved mid-plan search state path=artifacts/search-state-20260912/bs1/state.json attempts=63 bytes=22686508
2026-09-12T18:21:40.009276Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}:ipu_codegen.package.phase{phase="plan_package"}: package build phase finished phase="plan_package" elapsed_ms=722077 success=true
2026-09-12T18:21:41.676563Z  INFO ipu_codegen.package.build{tile_count=1472 operations=25}: wrote exact tile placement profile path=artifacts/search-state-20260912/bs1/extended/memory/placement-480354.html
2026-09-12T18:21:42.231332Z  INFO writing application package tiles=1472
2026-09-12T18:21:42.332258Z  INFO application package written
2026-09-12T18:21:42.333041Z  INFO reading application package
2026-09-12T18:21:42.468822Z  INFO application package read tiles=1472 compiler=0.1.0
2026-09-12T18:21:42.474375Z  INFO waiting for hardware ownership path=artifacts/layout-sweep/device.lock
2026-09-12T18:21:42.474390Z  INFO acquired hardware ownership path=artifacts/layout-sweep/device.lock
2026-09-12T18:21:42.474396Z  INFO opening IPU device path="/dev/ipu0"
2026-09-12T18:21:42.474422Z  INFO IPU device attached path=/dev/ipu0
2026-09-12T18:21:42.474425Z  INFO initializing IPU device
2026-09-12T18:21:42.482240Z  INFO IPU device initialized
2026-09-12T18:21:42.482281Z  INFO replaying device configuration register_writes=2003
2026-09-12T18:21:42.512738Z  INFO loading application tile_count=1472 final_mark=23
2026-09-12T18:21:42.682186Z  INFO application loaded and initial synchronization completed tile_count=1472
2026-09-12T18:21:44.657814Z  INFO prepared reference inputs elapsed_ms=1973
2026-09-12T18:21:44.658187Z  INFO configured host reference BLAS threads=4
referencePrecision=fp32
2026-09-12T18:22:05.559928Z  INFO evaluated host reference elapsed_ms=20902
2026-09-12T18:22:05.565844Z  INFO starting host exchange session startup_mark=23
2026-09-12T18:22:05.565865Z  INFO attaching host exchange pages pages=2
2026-09-12T18:22:05.567223Z  INFO host exchange session started
2026-09-12T18:22:05.570389Z  INFO invoking streaming host exchange call call="initialize" command=0 phases=342
2026-09-12T18:22:05.817324Z  INFO invoking streaming host exchange call call="run" command=0 phases=7
referenceMinimumCosineSimilarity=0.994264800
referenceInference=1 numericalTest=PASS
2026-09-12T18:22:05.826892Z  INFO invoking streaming host exchange call call="run" command=0 phases=7
referenceMinimumCosineSimilarity=0.994264800
referenceInference=2 numericalTest=PASS
referenceMaximumAbsoluteError=0.470994 numericalTest=PASS
package=artifacts/search-state-20260912/bs1/extended/model.ipuexe tiles=1472 hardwareTest=PASS